| 摘要 |
In a device for inspecting watch movements, a piezoelectric contact microphone is supported for engagement with the stem of a watch movement which is urged into axial engagement with the piezoelectric element of the microphone to transmit the vibrations of the watch movement to the element whereby the compressive stresses applied thereto are varied and an output voltage is produced which is adapted to be used in examining the accuracy of the watch movement.
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