Antique radios, Old Time Radios
6957
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Country:
United States of America (USA)
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| Identical to |
6957
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| Base |
Octal (Int.Octal, IO) K8A, USA 1935
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| Filament |
--/-- |
| Description |
Photoresistor for use in street-lighting control. 3300 to 7400 angstroms spectral respone; capable of directly driving a relay.
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