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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. Terminal, Telegraph TH-22/TG, schematic diagram
Telegraph Key | Let's Talk Science
Before the Phone
Electroacoustic Multiplexing Telegraph – US Patent 185507
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Ask the Wire Chief
Telegraph Instruments
Figure FO-4(1). Terminal, Telegraph TH-22/TG, wiring diagram (sheet 1 of 2)