73213853
May 1, 1979
Jul 21, 1981
[ Ceramic Articles-Namely, Lids for Integrated Circuit Packages, Precision Machine Bearings, Thread Guides and Pipes for Trimmer Condensers ]
Electrical and Scientific ApparatusElectric Arc Tubes for High Density Discharge Lamps [ and Far Infrared Ray Heaters and Heating Elements ]
Environmental Control Apparatus