NASA NTRS · 19770000287
Hearing-aid tester
Abstract
Hearing aids are automatically checked by circuit that applies half-second test signal every thirty minutes. If hearing-aid output is distorted, too small, or if battery is too low, a warning lamp is activated. Test circuit is incorporated directly into hearing-aid package.
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Kessinger, R., Polhemus, J. T., Waring, J. G.. 1977-11-01. Hearing-aid tester. https://ntrs.nasa.gov/citations/19770000287
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