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Figure FO-4(1). Terminal, Telegraph TH-22/TG, wiring diagram (sheet 1 of 2)
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Figure FO-4(1). Terminal, Telegraph TH-22/TG, wiring diagram (sheet 1 of 2)
Electroacoustic Multiplexing Telegraph – US Patent 185507
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Figure FO-4(2). Terminal, Telegraph TH-22/TG, wiring diagram (sheet 2 of 2)