s ▁like ▁the ▁S iem ens / C es ka ▁Z bro j ov ka ▁T - 1 0 0 ▁or ▁the ▁R FT ▁T - 5 1 . ▁The ▁maximum ▁transmission ▁speed ▁was ▁at ▁ 5 0 ▁or ▁ 7 5 ▁Baud . ▁The ▁system ▁was ▁cleared ▁up ▁to ▁the ▁top ▁secret ▁level ▁by ▁the ▁Pol es ▁provided ▁that ▁it ▁served ▁within ▁the ▁Temp ested ▁environment . ▁ ▁A ▁newer ▁and ▁slightly ▁improved ▁model ▁using ▁the ▁T TL ▁technology ▁instead ▁of ▁tor oid ▁cores ▁logic ▁was ▁developed ▁in ▁the ▁late ▁ 1 9 7 0 s ▁and ▁named ▁the ▁T g S - 3 ▁D U DE K . ▁ ▁The ▁last ▁D U DE K ▁sets ▁were ▁retired ▁by ▁the ▁Pol ic ja ▁as ▁of ▁January ▁ 1 , ▁ 2 0 1 1 . ▁ ▁Vers ions ▁At ▁least ▁four ▁basic ▁versions ▁are ▁known ▁to ▁have ▁existed : ▁ ▁T g S - 1 ▁- ▁basic ▁version . ▁ ▁T g S - 1 M ▁- ▁mobile ▁version . ▁ ▁T g S - 1 MS ▁- ▁mobile ▁version . ▁ ▁T g S - 3 ▁- ▁a ▁newer ▁version ▁introduced ▁into ▁the ▁service ▁in ▁Poland ▁in ▁the ▁early ▁ 1 9 8 0 s , ▁which ▁used ▁the ▁T TL ▁technology ▁instead ▁of ▁tor oid ▁cores ▁logic . ▁ ▁Each ▁version ▁also ▁had ▁derivative ▁models , ▁which ▁differ ed ▁with ▁regard ▁to ▁the ▁type ▁of ▁p unch ed ▁paper ▁readers ▁and ▁the ▁associated ▁anc ill aries . ▁ ▁The