Issued Patents 2002
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6340050 | Internally grooved heat exchanger pipe and metal bar working roll for internally grooved heat exchanger pipes | Kouzi Yamamoto, Kenzi Nakamizo, Toshiaki Hashizume | 2002-01-22 |