MELCO

SOLID STATE ELECTRONIC EQUIPMENT SPECIFICALLY FOR THE TELEPHONE INDUSTRY-NAMELY, HARD-OF-HEARING AMPLIFIERS FOR TELEPHONE HAND SETS, INTER-OFFICE KEY TELEPHONE INTERCOM UNITS USED IN SPECIFIC AREAS OF COMMUNICATION THAT OPERATE BY THE TOUCH-TONE METHOD, AND SOLID STATE SWITCHES DESIGNED TO OPERATE ON THE TIP AND RING PAIRS OF TELEPHONE LINES