Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829256 | Insulation testing device for gas insulated apparatus | Toshio Ishikawa | 1989-05-09 |
| 4818825 | Insulating spacers for use in gas-insulated electric apparatus | Toshio Ishikawa | 1989-04-04 |