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INTERPHONES, PUSHBUTTON PANELS AND ELECTRIC DOOR RELEASE DEVICES, PUSHBUTTONS AND PUSHBUTTON PANELS MADE OF PLEXIGLAS, PRESENCE SIGNALLING UNITS, DEVICES FOR REQUESTING ENTRY TO OFFICES-NAMELY, BELLS AND BUZZERS, "DING-DONG" CHIMES, ELECTRO-MECHANICAL RINGERS HAVING A PERCUSSION DRUM IN THE FORM OF A BELL, AND WATERPROOF BELLS, LABEL-TYPE INDICATING PANELS, LIGHTED NUMBER INDICATING PANELS, SIGNAL LIGHTS WITH OR WITHOUT RELAYS, SPARES, RELAYS, LAMPS, TRANSFORMERS, ILLUMINATED NAME LABELS, LIGHTNING-ROD TIPS, ELECTRICALLY OPERATED LOCKS, "FLAG" SIGNAL LIGHTS