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A telephone hook or switchhook is an electrical switch which indicates when the phone is hung up, often with a lever or magnetic button inside the cradle or base where a telephone handset resides. It takes its name from old wooden wall telephones and candlestick telephones, where the mouthpiece was mounted on the telephone box and, due to sidetone…
Invention & Overview
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telephone switchhook hook cradle handset receiver switch electrical hung said invention off-hook use talking call sidetone on-hook turn claimed indicates
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