Issued Patents 2002
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6435763 | KEY HOLE INSERTION FOR MANHOLE AND MANHOLE COVER LOCKING APPARATUS EQUIPPED WITH THE KEY HOLE INSERTION AND MANHOLE COVER LOCKING SYSTEM AND UNLOCKING METHOD AND MANHOLE COVER OPENING AND CLOSING CONTROL SYSTEM | Tetsushi Sakane, Nakamaro Hyodo, Takashi Fujii, Hironori Namioka | 2002-08-20 |