a cushion means for cushioning the second input transducer, the output transducer, and the frame structure away from the ear, and for impeding {HEAD ~ the free flow} of {TAIL ~ air} parallel to said same plane between the ear canal and the pickup surface of the second input transducer 
of
a cushion means for cushioning the second input transducer , the output transducer , and the frame structure away from the ear , and for impeding { HEAD ~ the free flow } of { TAIL ~ air } parallel to said same plane between the ear canal and the pickup surface of the second input transducer
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