73684501
Sep 16, 1987
PRESSURE REGULATORS, PRESSURE SWITCHES, AND MONITORING AND CONTROL UNITS FOR USE IN FURNACES; GAS CONTROL SYSTEMS FOR USE IN FURNACES, COMPRISING PRESSURE REGULATORS, CONTROL AND SAFETY VALVES, FILTERS, PRESSURE SWITCHES, MONITORING AND CONTROL UNITS AND CONTROL AND SAFETY VALVES
Electrical and Scientific Apparatus