Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856781 | Game ball | Shigeo Doi, Hideki Sumida, Masayuki Tanaka | 1989-08-15 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856781 | Game ball | Shigeo Doi, Hideki Sumida, Masayuki Tanaka | 1989-08-15 |