Donald E. Clement

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Belleville, CA

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Patents Grantslast 30 patents

Information Patent Grant
Keyboard security for a telephone attendant console
- Patent number 4,562,310
- Issue date Dec 31, 1985
- Northern Telecom Limited
- James M. Watters
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Hands free answer intercom
- Patent number 4,293,740
- Issue date Oct 6, 1981
- Northern Telecom Limited
- William D. Gibb
- H04 - ELECTRIC COMMUNICATION TECHNIQUE