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J117 text

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Forum » Valves / tubes - Semiconductors » VALVES/TUBES / SEMICONDUCTORS in RADIOMUSEUM » J117 text
           
Robert Gillespie
Robert Gillespie
 
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27.Feb.20 01:11
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Around top of tube -

"CONNECTICUT"

"VACUUM TUBE DETECTOR"

"TYPE J-117. MADE IN U.S.A."

Around bottom of tube -

"PAT'D JAN. 14. 1919 OTHERS"

"PENDING. IN CANADA &"

"PRINCIPAL FOREIGN COUNTRIES"

Serial on glass marked "4980 B"

  
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