74018973
Jan 16, 1990
electrical heating equipment, namely tubular heaters; finned tubular heaters; cartridge heaters; strip heaters; screw plug heaters; flange heaters; pipe insert heaters; gate and gain heaters; circulation heaters; immersion heaters for melting soft metals; over-the-side immersion heaters; steam and hot water boilers; fluid heat transfer systems; industrial duct heaters; infrared heaters; percentage timers; thermostats; thermostat and well assemblies; thermocouples; thermocouple and well assemblies; thermocouple wire; contactors; transformers; wire and bus bar; blower unit heaters; portable construction heaters; convection heaters; fin tube air duct heaters
Environmental Control Apparatus