Inventor

KERMAN STEPHEN E

US3 patents

Patents

3 patents

US4081624AMar 28, 1978

Key telephone intercom line system

NITSUKO LTD8 citations70

US4185173AJan 22, 1980

Key telephone call signalling circuit

NITSUKO LTD5 citations60

US4087649AMay 2, 1978

Pulse counting circuit

NITSUKO LTD2 citations60