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Title: Frequency Meter BC-221-M [Go to resource]
Description: Frequency Meter BC-221-M.[A similar example existed to this which had a special type of valve unique to this type of electronic test equipment.] License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1944 Source: Science Museum Identifier: 1993-2899 Go to resource More Like this...
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