Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4315371 | Preset brake device for line drawing machine, drafting machine or like | Sadahiko Kotani | 1982-02-16 |
| 4233751 | Universal parallel ruler for three-dimensional drawing | Masao Koenuma | 1980-11-18 |
| 4206551 | Universal parallel ruler for three-dimensional drawing | Youichi Matsugu | 1980-06-10 |