| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 3 | |
| #2 | Germany | 2 | |
| #3 | France | 2 | |
| #4 | Republic of Korea | 2 | |
| #5 | Australia | 1 | |
| #6 | Canada | 1 | |
| #7 | India | 1 | |
| #8 | Italy | 1 | |
| #9 | Japan | 1 | |
| #10 | Sweden | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Turning | |
| #3 | Milling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hosoi Ryosuke | 11 |
| #2 | Imaoka Koji | 1 |
| #3 | Hosoi Rydsuke | 1 |
| Publication | Filing date | Title |
|---|---|---|
| JP2008254092A | Grinding method of twist drill, and grinding device used for the same | |
| KR820000399B1 | Drill having no chisel | |
| KR820000400B1 | Drill having cutting edges with the greatest curvature at the central portion thereof | |
| US4222690A | Drill having cutting edges with the greatest curvature at the central portion thereof | |
| US4132493A | Ball end mill |