73350095
Feb 12, 1982
Jan 29, 1985
Temperature and Heat-Flow Controllers; Heat Measurement and Display Circuits; Control Valves for Heat-Carrying Fluids
Electrical and Scientific ApparatusEnvironmental Control Apparatus-Namely, Gate, Washer, Bleeder and Cutoff Valves and Cocks for Plumbing or Heating Use
Environmental Control Apparatus