Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4354059 | Variable-directivity microphone device | Yukinobu Ishigaki, Kaoru Totsuka, Makoto Yamamoto | 1982-10-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4354059 | Variable-directivity microphone device | Yukinobu Ishigaki, Kaoru Totsuka, Makoto Yamamoto | 1982-10-12 |