NASA NTRS · 19790000030
A telephone multiline signaling system
Abstract
Telephone system interconnects users of from one to eight telephone lines in network. System is useful in coordinating activities in large plants and installations. It permits spontaneous conferences, paging, and monitoring from key locations.
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Toole, P. C., Belt, J. L., Goodloe, R., Leiniger, D. B.. 1979-08-01. A telephone multiline signaling system. https://ntrs.nasa.gov/citations/19790000030
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