73213847
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