G4-1A (Generator signalov. Drugie foto) 1960
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The standard signal generator "G4-1A" was produced presumably since 1961. This generator under the name "GSS-6A" produced allegedly since 1948. Generator "G4-1A" (GSS-6A) is designed to test and configure radio receiving equipment operating in the range from 100 kHz to 25 MHz.
Documentation:
Information from collection of Valery Khartchenko