NASA NTRS · 19790000166
Teletype test unit
Abstract
Device may be used to facilitate testing and fault isolation in teletype and modem systems that are used for communication by people who having hearing disabilities. Unit uses CMOS digital integrated circuitry which may be operated from relatively inexpensive battery of any voltage from 3 to 18 volts.
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Couch, R. H., Beall, H. C.. 1979-12-01. Teletype test unit. https://ntrs.nasa.gov/citations/19790000166
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