Study course for controlling officers examination: technical paper : introductory to telephony
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Contents: definitions, abbreviations, and symbols / table of symbols / the dry cell / secondary cells / protection from electrical hazards / test instruments / insulation and insulation resistance / audible and visual signalling and alarms / transmission and reception of speech / the magneto telephone / central battery and automatic telephones / transmission and signalling standards / unit magneto exchange / non-multiple magneto exchange / telephone lines / cables and wiring / safety precautions
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