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History of the manufacturer  

Common type Hong-Kong tube/semicond.

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Name: Common type Hong-Kong tube/semicond.    (HK)  
Abbreviation: commontube
Products: Tube manufacturer

Some models:
Country Year Name 1st Tube Notes
HK  68 MM Pocket Radio P-4108   MW-Taschengerät mit 6 Transistoren und 2 Dioden, Empfangsbereich: 520 - 1620kHz, ...