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GMRT Hotline Telephone System — National Centre for Radio Astrophysics
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Telephone Circuits And Wiring. I. A Simple Arrangement For Short Lines
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Monitoring Circuit for Telephone Line Usage - EEWeb
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Index 5 - Telephone-Related Circuit - Electrical Equipment Circuit
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GMRT Hotline Telephone System — National Centre for Radio Astrophysics
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Telephone Call Recorder | Electronic Circuit Diagrams & Schematics