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Telephone History... Antique Telephone & Collector's Items
The Phone pany had to make "ring voltage," normally 90VAC at 20 cycles, using special Ringing Voltage Generators. A regular electric motor drove a magneto (similar to the ones that were cranked by hand on phones), to provide ringing voltage.
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speakerphone phone line wiring diagram Gallery


telephone wiring schematics

telephone wiring schematics

amazon com at u0026t 955 corded expandable 4

amazon com at u0026t 955 corded expandable 4

41 impressive hobart convection oven service manual

41 impressive hobart convection oven service manual

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1977 fender stratocaster wiring diagram ernie ball wiring

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wiring diagram for phones wiring diagram cable

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