73273781
Aug 11, 1980
Apr 26, 1983
[MAGNETIC TAPE HEADS; ] PHONOGRAPHIC STYLUS; [VIDEO STYLUS;] PHONOGRAPHIC CANTILEVERS [; (( PHONOGRAPHIC PICKUP CARTRIDGES; MICRO AMPLIFIERS (LOUD SPEAKERS) FOR USE IN ELECTRONIC CALCULATORS; RARE-EARTH COBALT MAGNETS; AND CHEMICAL BALANCE FULCRUM IN THE FORM OF A TRIANGULAR PRISM ))]
Electrical and Scientific Apparatus