DEVICES FOR COMMUNICATING BETWEEN REMOTELOCATIONS OF A TELEPHONIC NAT URE, SIMPLEX AND DUPLEX DEVICES FOR COMMUNICATING BETWEEN REMOTE LOCATIONS HAVING SINGLE AND MULTIPLE STATIONS, TELEPHONE, DESK AND VIS VISUAL TELEVISION SCREEN DEVICES FOR COMMUNICATION WITH REMOTE LOCATIONS, SWITCHBOARDS FOR USE WITH SAME, AND VESTIBULE DIRECTORY PLATES AD PANELS WITH BUILT IN BUZZERS WITH WITHOUT DEVICES FOR COMMUNICATING BETWEEN REMOTELOCATIONS