[BC] DeForest and pure vacuum, nothing about Kahn

rj carpenter rcarpen at comcast.net
Fri Jun 29 08:04:11 CDT 2012

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> NO  LOOK   OOA  AND O1A   SAME AS 200A  AND 201A  0 HAD GAS  O1 HAD HARD VAC

The first digit of 3-digit tube type numbers indicated the manufacturer,

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