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- W1991419002 abstract "One of the most fruitful inventions in telephony took place at Bolton Percy, Yorkshire. A country curate discovered that crushed coke made a very good material for a variable-resistance microphone. That was in 1878. By 1957, the microphone and earphone that are used in almost all British Post Office telephone sets today were developed" @default.
- W1991419002 created "2016-06-24" @default.
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- W1991419002 date "1976-01-01" @default.
- W1991419002 modified "2023-09-28" @default.
- W1991419002 title "Subsequent developments in telephone instruments" @default.
- W1991419002 cites W1566553096 @default.
- W1991419002 doi "https://doi.org/10.1049/ep.1976.0079" @default.
- W1991419002 hasPublicationYear "1976" @default.
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