Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4272655 | Compact telephone set employing slidable actuated supervision switches | George W. MacKenzie, Norbert E. Yankielun | 1981-06-09 |
| D256917 | Combination telephone instrument | John De Filippis | 1980-09-16 |