73178879
Jul 20, 1978
Jul 14, 1981
Electrical Apparatus-Namely, Thermal Overloads in the Nature of Electrical Fuses, and Element Repair Wire Used in Heating Elements
Electrical and Scientific ApparatusInstallation for Heating Purposes-Namely, Crankcase Oil Heaters Used in Hermetic Elements Not for Use on Land Vehicles
Environmental Control Apparatus