73055338
Jun 16, 1975
Feb 24, 1981
Heating Installations-Namely, Electrical Heating Installations for Pipelines and Various Surfaces of Roads, Floors, Walls and Parts Thereof, Comprising Heat Tubes of Ferromagnetic Nature, Insulated Electric Wires, Switch Cubicles, Protective Relays, Temperature Control Devices Sold as a Unit
Environmental Control Apparatus