73658532
Sep 21, 1987
Feb 14, 1989
LINE OF TELEMETERING PRODUCTS COMPRISED OF; VARIOUS PLUG-IN MODULES, WHICH CONTAIN SWITCHES AND/OR INDICATOR LIGHTS TO TRANSMIT OR RECEIVE SIGNALS RELATING TO THE STATUS OF EVENTS, AND ARE THEREBY USED TO COLLECT DATA OR MONITOR OR CONTROL CERTAIN PROCESSES, INCLUDING FREQUENCY DOMAIN MULTIPLEXING, POINT STATUS SCANNING, ANALOG CONTROL AND DATA TRANSMISSION, AUDIO TONE SIGNALING AND DIGITAL SIGNALING
Electrical and Scientific Apparatus