21 ELECTRICALLY OPERATED RAILROAD CROSSING GUARDS; TAPE AND SHEET TELEPRINTERS; ELECTRIC GENERATORS; ELECTRIC MOTORS; ELECTROPLATING MACHINES; ELECTRIC HOUSEHOLD APPLIANCES-NAMELY, ELECTRIC FANS, ELECTRIC IRONS, ELECTRICALLY OPERATED VACUUM CLEANERS AND FLOOR WAXING MACHINES, AND ELECTRIC COFFEE GRINDERS; ELECTRIC POLISHING MACHINES; ELECTRIC APPARATUS FOR THE TRANSMISSION OR RECEPTION OF SOUND-NAMELY, SIMULTANEOUS TRANSLATORS, MICROPHONES, AMPLIFIERS, LOUDSPEAKERS, ELECTRIC MEGAPHONES, TUNER FILTERS, RECEIVERS FOR WIRE BROADCASTS AND WIRELESS BROADCASTS; ELECTRIC OSCILLATORS; ELECTRIC CONDENSERS; ELECTRIC RAILROAD SIGNALS AND CONTROLS; TROLS; ELECTRICAL RECORDERS FOR DUTY ROUNDS AND CALLS; ELECTRICAL ALARMS; ELECTRICAL ANNUNCIATORS AND ELECTRIC BELLS AND SIRENS; TELEPHONE EXCHANGES AND PARTS THEREOF; TELEPHONE HANDSETS AND HEADSETS AND LOUDSPEAKERS, BUTTON AND DIALING SELECTORS; INTERCOMS; MAGNETO PHONES; ELECTRIC DOORBELLS; TRANSMITTERS AND RECEIVERS FOR RADIOTELEGRAPHY; FACSIMILE TRANSMITTERS AND RECEIVERS; ELECTRIC CABLES AND WIRES, COAXIAL CABLES, WAVE GUIDES, COILS AND SWITCHBOARDS; RADIO TRANSMITTERS AND RECEIVERS; TRANSMISSION AND RECEPTION ANTENNAE; RADIO TUBES, RECTIFIER TUBES; TELEVISION TRANSMITTERS AND RECEIVERS; ELECTRICAL POWER GENERATORS; VARIABLE INDUCTORS; ELECTRICAL CONVERTERS; ELECTRICAL OZONE GENERATORS; CIRCUIT BREAKERS, ELECTRICAL BOOSTERS, ELECTRICAL REGULATORS AND CONTROL PANELS; ELECTRICAL SERVOMECHANISMS; ELECTRIC CABLE CONDUITS; ELECTRICAL TERMINAL BOARDS, TAPS, AND CURRENT PLUG-INS; ELECTRIC SWITCHES; SEMICONDUCTORS; TRANSFORMERS; ELECTRIC LAMPS; INCANDESCENT BULBS AND FLUORESCENT LIGHTS AND ELECTRICALLY ILLUMINATED CEILING PANELS; AND ELECTRICAL INSULATORS