| 摘要 |
A hearing aid switch of the type shown in U.S. Pat. No. 3,475,566 issued Oct. 28, 1969, is provided with additional contact position to add an additional mode of operation without increasing the size of the switch or the structure in which it is contained. The switch has three positions: an "on" position which connects the microphone of the hearing aid unit to the amplifier, a "mid" position which connects an additional transducer in the hearing aid to the amplifier (as for instance a telephone pick-up) and an "off" position.
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