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OPCOM

US3 patents

Top patents by PatentIndex Score

US4783796ANov 8, 1988

PBX telephone call control system

OPCOM110 citations94

US4747124AMay 24, 1988

PBX telephone call control system

OPCOM104 citations94

US4792967ADec 20, 1988

PBX DID and E and M tie trunk integration adapter and method

OPCOM29 citations85