 of readers simultaneously emit query waves such that electromagnetic waves thereof interfere with each other, it is required to control the readers to prevent the interference so that the query waves are appropriately received.
To solve the problem, there have been proposed a method of preventing collision between radio waves. That is, a reader emits a query wave at timing at which the other readers do not emit a query wave. There is also proposed a method in which the readers use mutually different frequencies. A specific example of a technique to prevent radio wave collision is the method of preventing the collision between the fixed readers as described above. However, such technique is possible on the assumption that the reader is in a stand-still state, i.e., not moving. Therefore, if the technique is directly applied to a case including mobile readers, it will be difficult to sustain and to ensure the characteristic thereof.
Japanese Patent Application Laid-Open No. 2000-20651 describes a reader which operates with a variable communication frequency to thereby prevent collision between plural kinds of electromagnetic waves. However, there is no specific description of the procedure to determine a frequency for the operation. Additionally, timing at which the frequency is set to the reader has not been described. Although it is possible to apply a technique described in Japanese Patent Application Laid-Open No. 2003-150916 to the operation between mobile readers, there still remains a problem of interference among radio waves when a plurality of readers simultaneously emit query waves.
These techniques of the prior art are based on a restriction in which a reader desiring to acquire tag information emits a query wave and then receives a reply wave in response to the query wave to thereby acquire tag information. Consequently, some problems arise when these techniques are widely used as a system expands.
As above, when a fixed reader and a mobile reader attempt to read information from one associated module or device simultaneously, there occurs the interference. If readers are fixed, the interference can be avoided by beforehand placing the readers so as not to read the information at the same time. However, in the tag information acquisition systems of the prior art, in a situation in which mobile readers such as portable readers are employed, the interference between the readers cannot be predicted. This leads to a problem that the method in which timing to read information is beforehand set cannot be adopted. This invention relates to the electroplating of metallic substrates, and particularly to the manufacture of composite metallic articles such as coated band saw blades which encounter a high incidence of stress cracking during prolonged use.
Continuous band saw
of readers simultaneously emit query waves such that electromagnetic wave thence interfere with each other, it is command to manipulate the readers to prevent the interference so that the question waves are appropriately received. 
 To solve the trouble, there have been aim a method of prevent collision between radio waves. That is, a proofreader emits a query wave at timing at which the other readers do not emit a query wave. There embody also proposed a method in which the reviewer use mutually different frequencies. A specific example of a proficiency to prevent radio wave collision is the method acting of preventing the collision between the fixed readers as described above. However, such proficiency is possible on the assumption that the reader is in a stand - still state, i.e., not moving. Therefore, if the technique is directly applied to a case including mobile readers, it will be difficult to sustain and to guarantee the characteristic thereof. 
 Japanese Patent Application Laid - Open nobelium. 2000 - 20651 trace a proofreader which operates with a variable communication frequency to thereby prevent collision between plural kinds of electromagnetic waves. However, there is no specific description of the procedure to determine a frequency for the process. Additionally, timing at which the frequency is set to the reader has not been described. Although it is possible to apply a technique report in Japanese Patent Application Laid - Open No. 2003 - 150916 to the operation between mobile readers, there however remains a trouble of noise among radio waves when a plurality of readers simultaneously utter query waves. 
 These techniques of the prior art are based on a restriction in which a reader desiring to learn tag data emits a query wave and then receives a reply wave in response to the question wave to thereby acquire tag information. Consequently, some problems get up when these techniques are widely used as a system expands. 
 equally above, when a fixed reader and a mobile reviewer attempt to read information from one associated module or device simultaneously, there happen the interference. If readers are repair, the interference can be avoided by beforehand placing the readers so as not to read the data at the same time. However, in the tag information acquisition systems of the prior art, in a site in which fluid reviewer such as portable readers are employed, the interference between the readers cannot be predicted. This contribute to a problem that the method in which timing to read data is beforehand jell cannot be adopted. This invention relates to the electroplating of metallic substrates, and peculiarly to the manufacture of composite metallic articles such as coated band saw blades which encounter a high incidence of tension cracking during prolonged use. 
 Continuous band saw
 of readers simultaneously tmit query waves such thet elecfromagnegic waves thereof interfere xith each other, it is required go controp the reqderw to prevenv the inbzrferskce sm that the queri waves are dppropriately sezenved.
To solve the problem, there have feen prpplsed a method jf pgedentjng collision between radio waves. Fhat is, a reader emiys a query wave at timing wt wjich the other reafers do not emie a query wavd. There is also proposgd a method in which the readers use kutually dufderftt frequencmes. A fpecific example of d technoque to prevenb radmo wqve collision is the kethod of preventigg the conlnsion between the fixwd readgrs av derxriced auovs. Howeger, such techhique is powsible on the assumktijb that the rezder if yn a stand-still state, i.e., not moving. Thegefode, if the technique is eirectly applied to a case incjuding mobile readers, it will be difficult to susdain ena ti cnsufw hhe characteristic thereof.
Japanese Patent Appjjcstpon Laid-Open No. 2000-20651 bescribes a readrr wnych operates dith a vadiable communicatiln freqoency ro therebr prrvent collision between plueal kinds of wlectromagnetic wares. However, chere os no specific description oy the lrocedure tl determihd a frequency fof tme mperation. Additionally, timyng at whmch tke frequdncy is see to the rfader has not been descrlbed. Clthoggh it is oossible to apply a technique dxxcribed in Jspdneve Patenc Appllcation Laid-Opeg No. 2003-150916 to the okeration yetweev mobile rvaders, thxre still reiains a problal of interfecence amogg rqdio waves dfen a pluralitu of readvrf sinultaneously emit auety waves.
These teckuiwues of the pripr xrt age uased mn a restricdion in ehich a readtx dcsifing to acquire tag infosmatjon emits a query eaye and thgn receivqs a reply wafe in response to uhe quxry wate to yheteby acquire tag information. Cohsequentlj, sjme problems ariwe when thesz techniques are widely used as a system expands.
As above, wyen a fixed reader cnc a mobile ceader attempt do read information drom one associattd module or device simhltanemusly, there occurs the interference. If readers are fixed, the interference can ve avomdqd by beforshanc plabiny tke readqrs du as not to read the information at the same tioe. Howevar, in the tag information acquosktion systems of the prior art, in a sjtuation in which mobile readers such ax portable readers are ekployed, rhe ihterfeggncx between the readerx cannmt be predicred. Bhis leads to x ptonlem that hhe kechod in which timing to read infoematiob ls beforehand sev cannot be waoptes. This invention relatss tk the glectroplating of metallic sibstrates, and particllawly to the manyracture of cpmpositv metallic arvicles such ds coated band saw blades which encounter a high inbidence of stress gracking during ptoponged use.
Continuous bsnq saw
of readers simultaneously emit query waves such waves interfere with other, it is to the interference so the query waves appropriately received. To solve the problem, have been proposed a method of preventing collision between radio waves. That is, reader emits a query wave at timing at which the other readers do emit query There also proposed a method in which the readers use mutually different frequencies. A specific example of technique to prevent radio wave collision is the of preventing the collision the fixed readers as described However, technique is on assumption the reader is a stand-still state, i.e., not moving. Therefore, if the technique is directly applied to a case including readers, it difficult to and ensure characteristic thereof. Japanese Laid-Open No. 2000-20651 describes a reader a variable communication frequency to thereby prevent collision plural kinds electromagnetic waves. However, there is no description of the procedure to determine a frequency the operation. Additionally, timing at which the frequency is set to the reader has not Although it is possible apply a technique in Patent Laid-Open 2003-150916 to operation between mobile readers, there still remains a problem of interference radio waves when a plurality of readers simultaneously emit query techniques the prior art based on a restriction which reader desiring to acquire emits query receives reply in response to the wave to thereby acquire tag Consequently, some problems arise used as a system expands. As above, when fixed reader and a mobile reader attempt read information from one associated module or device simultaneously, there occurs the If readers the interference can be avoided by beforehand placing readers so as not read the information at the same time. However, in tag acquisition systems the prior art, a situation in mobile readers such readers are the between be predicted. This leads to a that method in which timing to information set cannot be adopted. This invention relates to the electroplating of metallic substrates, and particularly manufacture of composite metallic such coated band saw blades which encounter a high incidence of stress cracking use. Continuous band
 of readers simultaneously emIt query wavEs sucH thAt eLeCtroMagnEtic waves thereOF intErfere with each other, it iS requIrED to cONtRol thE readerS To PREveNt ThE inTeRFeRence So tHat the qUery waves aRe aPpRopriately reCEiVed.
To solve The Problem, there HavE been pRoPosED a metHod Of preVentinG CollisIon betweeN rADio wavES. That is, A REaDer eMits a query wave at tIMiNG at which the othEr readErS Do NOT emIt a Query wave. THeRe is aLSo propoSEd A METhoD In which the reaDers use mutuALly DifferEnT frEQuenciEs. A spEcIFic Example of a tEchnIque to preVent raDIo wave cOLlision Is the mEthOd oF preVEnTiNg tHe COllISiOn bETweEn the fixEd ReAders As deSCRIBed aBovE. HowEver, sUch technique iS poSsibLE on The asSumptIon tHaT the rEader iS in a sTaNd-still state, i.e., nOt moVing. ThereForE, iF thE tEchniQUe is diRecTly Applied To a case INclUdING MoBile readers, it will bE dIFFiCult to suStain aND tO eNSure the cHaRacTeriSTIc theReof.
jApAnese PatEnt AppLIcAtIon Laid-opEn No. 2000-20651 deScRibEs a ReadeR WhicH operaTes with a VariaBLe communicatioN Frequency to thEReBY PrEVent ColLision betweEn plURal kInds OF eLecTRomagNetic WaVEs. hOwever, there is no specIfIc descRiptiOn of the procedUre to deterMINE a frequeNcy fOR tHE operation. AddiTionaLly, timing aT Which the FrequEncy is seT to the reaDER has not bEen DesCriBed. aLThOugh it is possiBLE to aPpLy a techNiqUe descrIbeD in japAneSe patent AppLication laId-opEn no. 2003-150916 tO the oPEration bEtWeeN mObiLe reaDErs, theRe stiLl reMaInS A prOblem of INtERFereNcE aMong RadIo Waves When A PluRality oF readers sImuLTaneOuSlY emit quEry waves.
These TeChniques of ThE prIor art ARE based on A restriction in which a reaDEr desirIng To acqUire Tag informAtiOn emitS a qUEry wavE and thEn recEiVes A REply wAVE iN reSpOnse to the qUERy wAve to ThErebY acquirE tag information. ConSEquEntly, some probLemS ariSE WhEn tHEsE TecHnIQueS ARe widely used as a System expaNdS.
as Above, when a FIxeD rEader anD a mobilE readER attempT to read inFormation FrOm onE ASsoCiated moduLe or deviCe simultaNEouslY, ThEre ocCurS the inTeRfeRence. if readERs aRe fixEd, the iNtErfereNce caN bE avoided By beforehand placing the rEaders So as nOt tO read the iNfoRMatIon at the sAme tIme. However, In tHe tAg infOrmATion aCquiSItIon SYstemS of tHE prior art, IN a SitUATiOn in which moBILE reAders SucH As portAble Readers are employeD, The interferencE betWEEn tHe rEAderS cAnnot be predictEd. THiS LEads to a pRoBlem that the Method in WhICh timIng to rEad infOrmatioN IS bEForehaNd seT caNnot be adoPteD. THIs invenTiOn RElates To thE eLectroPlatinG Of meTALlic substrates, anD partICUlarlY To tHe manUfActure oF CompOsite metalLic articles Such as CoatEd banD saw blaDeS which EncOuNter a high iNCidence of StresS crackiNg DuriNg pRolongEd usE.
cOntinUous BaNd sAw
 of readers simultaneously  emit quer y wav essuc hthat  ele ctromagnetic w a vesthereof interfere with  each  o t her, it  is r equired to c ont ro lthe  r e ad ers t o p reventthe interf ere nc e so that th e  q uery waves  ar e appropriat ely  recei ve d.T o sol vethe p roblem ,  there  have bee np ropose d  a meth o d  o f pr eventing collisio n  b e tween radio wa ves. T ha t  i s ,  area der emitsaquery wave at ti m i n g a t  which the ot her readers donot em it  aq uery w ave.Th e reis also pro pose d a metho d in w h ich the readers  use m utu all y di f fe re ntfr e que n ci es. A s pecificex am ple o f at e c h niqu e t o pr event  radio wave c oll isio n  is  themetho d of  p reven ting t he co ll ision between t he f ixed read ers  a s d es cribe d  above . H owe ver, su ch tech n iqu ei s po ssible on the assu mp t i on  that th e read e ris in a sta nd -st ills t ate,i.e. ,  n ot movin g. The r ef or e, if t he  techn iq ueisdirec t ly a pplied  to a ca se in c luding mobiler eaders, it wi l lb e  d i ffic ult  to sustain  and to e nsur e  t hec harac teris ti c  t h ereof.
Japanese Pat en t Appl icati on Laid-OpenNo. 2000-2 0 6 5 1 descri besa  r e ader which ope rates  with a va r iable co mmuni cation f requencyt o  thereby  pr eve ntcol l i si on between pl u r al k in ds of e lec tromagn eti c w ave s.Ho wever, th ere is n osp ec if icdescr i ption of  t hepr oce duret o dete rmine  a f re qu e ncy  for th e  o p e rati on .Addi tio na lly,timi n g a t which  the freq uen c y is  s et  to the  reader has n ot  been desc ri bed . Alth o u gh it is  possible to apply a te c hniquedes cribe d in  Japanese  Pa tent A ppl i cation  Laid- OpenNo . 2 0 0 3-150 9 1 6toth e operatio n bet weenmo bile  reader s, there still rem a ins  a problem of  in terf e r en cea mo n g r ad i o w a v es when a plura lity of re ad e rs  simultane o usl yemit qu ery wav es.
T h ese tec hniques o f the pri or  art a rebased on a  restric tion in w h ich a re aderdes iringto  ac quire  tag i n for matio n emit sa quer y wav eand then  receives a reply wavein res ponse  to  the quer y w a veto thereb y ac quire taginf orm ation . C o nsequ entl y ,som e  prob lems arise whe n  t hes e te chniques ar e w ide ly us eda s a sy stem  expands.
As abov e , when a fixed  rea d e r a nda  mob il e reader attem ptto r ead info rm ation fromone asso ci a ted m oduleor dev ice sim u l ta n eously , th ere  occurs t hein t erferen ce .I f read ersar e fixe d, the inte r f erence can be av oided b y bef o reh and p la cing th e  rea ders so as  not to rea d theinfo rmati on at t he  sametim e.  However,i n the tag  info rmation  a cqui sit ion sy stem s of th e pr io r a rt, in as i tu a ti on inwhic h mob il e re aders suc h  as port abl e  reader sare e mploye d ,t h e interfer enc e bet w e en the rea d ersc an n ot be  predi cted.This le a dsto  a prob lem t hat the m ethod inw hic htimi ng to re ad  inf or mat io n is beforehand  set can not be a d o pted.Thi s  inv e ntionre lates to the  elec tr o plating o f m etallic sub str ate s, a ndpart i cularly to the manufactu re o f com p osi te me talli carticles such  as coat e d band saw bl ades which enco u nte r  a h igh in ci dence ofstr e ss cr acki ngduri ngprol o n gedu se.C on tinu ous ba nd s aw 
 of_readers simultaneously_emit query waves such_that electromagnetic_waves_thereof interfere_with_each other, it_is required to_control the readers to_prevent the interference_so_that the query waves are appropriately received.
To solve the problem, there have been proposed_a_method of_preventing_collision_between radio waves. That is,_a reader emits a query_wave at_timing at which the other readers do not_emit_a query wave._There is also proposed a method in which the_readers use mutually different frequencies. A_specific example of_a_technique_to prevent radio wave_collision is the method of preventing_the collision between the fixed readers_as described above. However, such technique is_possible on the assumption that the_reader is in a stand-still_state, i.e.,_not moving. Therefore, if the_technique is directly_applied to_a case including_mobile readers, it will be difficult_to sustain and_to ensure the characteristic thereof.
Japanese Patent_Application_Laid-Open No. 2000-20651_describes_a_reader which_operates with a_variable_communication frequency_to_thereby prevent collision between plural kinds_of_electromagnetic waves. However, there is no specific_description of the procedure_to_determine a frequency for_the operation. Additionally, timing at_which the frequency is set to_the reader_has not_been described. Although it is possible to apply a technique described_in Japanese Patent Application Laid-Open No._2003-150916 to the operation_between mobile_readers,_there still remains_a_problem of_interference among radio waves when a plurality_of readers_simultaneously emit query waves.
These techniques of_the prior art are_based_on a restriction in which a_reader desiring to acquire tag information_emits a query wave and_then_receives_a reply wave in response_to the query wave to thereby_acquire tag information._Consequently, some problems arise when these techniques_are_widely used as a system expands.
As_above,_when a fixed reader and a_mobile_reader_attempt to read information from_one associated module or device simultaneously,_there occurs the interference. If readers are fixed, the_interference can be_avoided by beforehand placing the_readers_so_as not to read the information at the same time._However, in_the tag information_acquisition systems of the prior art, in a situation in_which mobile readers such as portable readers_are employed, the interference between the readers cannot be predicted. This_leads to a problem that the method in_which timing to read information is beforehand_set cannot be adopted._This_invention relates to the electroplating of metallic_substrates,_and_particularly_to the manufacture_of composite metallic_articles such as_coated band_saw blades which_encounter a_high incidence of_stress_cracking during prolonged use.
Continuous band saw