illery ▁Department ▁of ▁the ▁Polish ▁Ministry ▁of ▁National ▁Def ense . ▁Short ly ▁before ▁the ▁war , ▁he ▁joined ▁the ▁c land est ine ▁Special ▁Sign als ▁Unit , ▁a ▁secret ▁inst itute ▁that ▁worked ▁on ▁electronic ▁app li ances ▁for ▁the ▁army . ▁Following ▁the ▁ 1 9 3 9 ▁invasion ▁of ▁Poland , ▁he ▁managed ▁to ▁get ▁to ▁the ▁United ▁Kingdom , ▁where ▁he ▁continued ▁his ▁service ▁in ▁the ▁Polish ▁Army ▁as ▁a ▁signals ▁officer . ▁In ▁ 1 9 4 1 ▁he ▁de vised ▁his ▁Polish ▁Mine ▁Det ector . ▁It ▁was ▁to ▁be ▁used ▁for ▁the ▁first ▁time ▁in ▁action ▁on ▁Second ▁Battle ▁of ▁El ▁Al ame in . ▁Five ▁hundred ▁of ▁these ▁detect ors ▁were ▁issued ▁to ▁E ighth ▁Army . ▁They ▁double d ▁the ▁speed ▁at ▁which ▁heavily ▁m ined ▁s ands ▁could ▁be ▁cleared , ▁from ▁ 1 0 0 ▁to ▁ 2 0 0 ▁meters ▁an ▁hour . ▁The ▁device ▁was ▁used ▁until ▁the ▁ 1 9 9 1 ▁G ulf ▁War . ▁ ▁After ▁the ▁war ▁he ▁returned ▁to ▁Poland , ▁where ▁he ▁became ▁a ▁pione er ▁of ▁electron ics ▁and ▁nuclear ▁mach in ery . ▁For ▁many ▁years ▁he ▁held ▁the ▁chair ▁in ▁electron ics ▁at ▁the ▁Institute ▁for ▁N uc lear ▁Research ▁at ▁Ot wo ck ▁- ▁Ś w ier k . ▁He ▁was ▁also ▁a ▁professor ▁at ▁the ▁Military ▁Techn ical ▁Academy ▁in ▁Wars aw . ▁He ▁died ▁in ▁ 1 9 9 0 ▁and ▁was ▁buried ▁with ▁military ▁hon ors