Browdy and Neimark
Headset microphone having a location apparatus
 A microphone of the headset is composed of a base which is provided with a plurality of locating projections. The base of the microphone is fastened pivotally with a recess of the base of the ear cushion of the headset such that the locating projections of the base of the microphone are engaged with a locating portion of the recess of the ear cushion, and that the microphone can be swiveled and located as desired. 
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additional additional inventional
Ching-Wen
Chang