Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857883 | Call device-attached patrol recorder | — | 1989-08-15 |
| 4516138 | Time-clock recording and computation apparatus with optional rest processing function | Hiroshi Iwasawa, Masanori Numata | 1985-05-07 |