74713254
Aug 9, 1995
controlling systems for low-pressure hot-water heating composed of mechanical and electrical controllers of room temperature, pressure gauges, temperature gauges, corrosion gauges, manifolds, pumps, filtering units, thermostatic valves, thermal actuators, heads, pipes, servomotors, regulators, valve controllers, timers, thermostats, oxygen filters, air heaters, and/or radiators
Electrical and Scientific Apparatus