73109811
Dec 16, 1976
Sep 18, 1979
ELECTRONIC COMPUTER TELEMETERING AND DATA ACQUISITION EQUIPMENT-NAMELY, ANALOG TO DIGITAL CONVERTERS, DATA MEMORY CIRCUITS, DATA CENTRAL PROCESSING CIRCUITS, PARALLEL TO SERIAL AND SERIAL TO PARALLEL DATA CONVERTERS, FREQUENCY SHIFT DATA MODULATORS AND DEMODULATORS, TELEPHONE LINE DATA COUPLERS, TELEPHONE LINE ACTIVE TRANSFORMERS
Electrical and Scientific Apparatus