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History of the manufacturer  

PTR - Polskie Towarzystwo Radjotechniczne; Warszawa

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Name: PTR - Polskie Towarzystwo Radjotechniczne; Warszawa    (PL)  
Abbreviation: ptr
Products: Model types Tube manufacturer

Polskie Towarzystwo Radjotechniczne (PTR)
Ul. Narbuta 29, Warszawa

Aparatów odbiorczych, lamp katodowych, sprzętu radiotechniczne.

See also: Polskie Zakłady Marconi


Some models:
Country Year Name 1st Tube Notes
PL  24–28 5 LC/2   Wechseln Bereich - Schalter. Wooden case with black front panel. 
PL  24–28 4 LB SRM   
PL  24–28 5 LB RM  Wellenbereich - 3 wechseln Teilen. Alternative tubes: 4× SRM and 1× DE. 
PL  27/28 5 LS/1 S625  The tube S625 came on the market in 1927. We have no evidence that this model 5 LS/1 from ... 
PL  24–28 3 LB SRM   
PL  24–28 4 LB/S1 SRM  mit Bereichsschalter. 
PL  24 5 LC   Bereich wechseln - Schalter. Wooden case with white front plate. 
PL  24–28 2 LE    
PL  24–28 3 LE    
PL  24–28 4 LE    
PL  24–28 2 LM    
PL  24–28 1 LM    


Further details for this manufacturer by the members (rmfiorg):

Flyer PTR, date unknown.tbn_pl_ptr_prospekt.jpg