Showing papers on "Condition monitoring published in 1972"
Patent•
22 May 1972
TL;DR: In this article, a remote condition monitoring device is used to connect into preexisting telephone station lines when a monitored physical condition exceeds preset limits, and a warning tone is produced which is audible to the caller over the completed telephone calling circuit.
Abstract: A remote condition monitoring device is operative to connect into preexisting telephone station lines when a monitored physical condition exceeds preset limits. An incoming call causes completion of the calling circuit by simulating the lifting of a receiver at the called station. A warning tone is produced which is audible to the caller over the completed telephone calling circuit.
9 citations