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Hearing-aid testerHearing 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.
Document ID
19770000287
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Kessinger, R. (Martin Marietta Corp.)
Polhemus, J. T. (Martin Marietta Corp.)
Waring, J. G. (Martin Marietta Corp.)
Date Acquired
August 8, 2013
Publication Date
November 1, 1977
Publication Information
Publication: NASA Tech Briefs
Volume: 2
Issue: 3
ISSN: 0145-319X
Subject Category
Life Sciences
Report/Patent Number
MSC-14916
Accession Number
77B10287
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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