NEON TUBE OSCILLATOR
A Neon Tube Rhythmic Oscillator, an ingenious instrument to enable testing of telephonic equipment to be carried out direct from the telephone exchange
Picture No
10153428
Media ID
44863141
Size
4643px x 3618px
(2.2MB)
Credit
Mary Evans Picture Library
Source
Unattributed photograph for Barnaby's Studios Ltd
Date
March 1933
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Bulbs Direct Enable Ingenious Neon Oscillator Rhythmic Telephonic
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