Double pole receiver

Double pole receiver, membrane diaphragm

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Double pole receiver, membrane diaphragm
Science Museum Group

Double pole receiver, membrane diaphragm, believed to have been used with the Thompson valve telephone, marked 'patent membrane receiver' on brass plate and '4946' stamped on earpiece (3)

Details

Category:
Telecommunications
Object Number:
1923-214
type:
receiver
credit:
Institution of Electrical Engineers

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