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Precision sound level meter, 1960-1979.
Precision sound level meter, 1960-1979.
Microphone made by EMI, c 1938.
Watt's tubular Surface Condenser, 1765.
Three-nail microphone, c 1878.
Three-nail microphone, c 1878.
BBC Marconi ribbon microphone, 1934-1959.
BBC Marconi ribbon microphone, 1934-1959.
BBC Marconi ribbon microphone, 1934-1959.
Cylindrical condenser, 1761.
Cylindrical condenser, 1761.
Triple expansion 4-crank surface-condensing twin-screw engines.
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