Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4951758 | Method of drilling a branch line aperture after internal lining of a pipeline and a water plug used in the method | Masahisa Sonku, Yukio Yoshimura, Minoru Yasuhara, Naoki Kitahashi, Hirozo Hirayama +1 more | 1990-08-28 |