NASA NTRS · 19780000024
Preventing radio-paging system tieup
Abstract
Time-delay relay limits message time of emergency radio-paging system, thereby preventing inadvertent tieup. Relay is connected with telephone circuit and permits adjustable message time between 30 and 55 seconds. After that time interval, relay opens, making line free for another paging regardless of what previous caller did with his telephone.
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Jasmin, J. P.. 1978-06-01. Preventing radio-paging system tieup. https://ntrs.nasa.gov/citations/19780000024
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