Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853638 | Water quality control method, and method and apparatus for measuring electrical conductivity used in the water quality control | Masao Endou, Yamato Asakura, Atsushi Watanabe, Shunsuke Uchida, Makoto Nagase +2 more | 1989-08-01 |