Word: helix
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Dates: during 1940-1949
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...HELIX (242 pp.)-David Loughlin-Harper...
during the war. Helix, his first novel...
...adaptation of their main product-hearing aids. An impression is taken of the outer folds and canal entrance of the ear. From this cast a polished plastic plug is made which extends into the auditory canal, is locked in place by a lip which fits over the helix (rim of the external ear). Light and clean, the plug is easily inserted with a twisting motion, cannot be pushed in too far, leaves sufficient leeway to equalize air pressures...