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a number of kit-type electronic devices such as radio transmitter sets- like one by GE If I remember correctly, were marketed in transparent cases, so on display all the major components of the set- tubes, transistors, capacitors, relays, etc would be clearly visible and usually a circuit diagram was printed on the breadboard of the assembly- do not confuse with printed circuits- this is more like a map or assembly diagram. They were clearly angled at the youth and especially the Science-Fair market.

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16y ago

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