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[ HARD RUBBER PARTS OF TELEPHONE RECEIVERS OR TRANSMITTERS; STORAGE BATTERY CASES AND PARTS THEREOF, OF HARD RUBBER, OR OF SUBSTITUTES OR IMITATIONS THEREOF; RUBBER OR EBONITE PARTS OF ELECTRICAL HOME APPLIANCES-FOR EXAMPLE, RUBBER OR EBONITE HANDLES FOR FLATIRONS, TOASTERS, COFFEE MAKERS, ETC.; EBONITE PARTS OF MAGNETS; ] NON-ELECTRIC CONDUCTING MATERIALS AND ACCESSORIES FOR ELECTRIC INSTALLATIONS; NAMELY, INSULATING MIXTURES, POTHEADS, NON-CONDUCTING PARTS OF ELECTRICAL SWITCHES, CONNECTIONS, PLUGS AND SOCKETS, AND INSULATING TAPES; CABLES AND ELECTRIC LINE WIRES FOR GENERATION, TRANSMISSION, DISTRIBUTION, AND APPLICATION OF ELECTRICITY