| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 8 | |
| #2 | EPO (European Patent Office) | 4 | |
| #3 | Japan | 4 | |
| #4 | United States | 4 | |
| #5 | Canada | 3 | |
| #6 | Republic of Korea | 2 | |
| #7 | China | 1 | |
| #8 | German Democratic Republic | 1 | |
| #9 | Ireland | 1 | |
| #10 | Portugal | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Telecommunications |
| # | Technology | |
|---|---|---|
| #1 | Turning | |
| #2 | Unspecified technologies | |
| #3 | Transmission systems | |
| #4 | Accessories for machine tools | |
| #5 | Milling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Zettl Otto | 24 |
| #2 | Otsutoo Tsuetoru | 2 |
| #3 | Zettl Otto Sr | 1 |
| #4 | Zettl Otto Jr | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE4304251A1 | Chuck | |
| DE4026651A1 | CUTTING HEAD AND A MILLING TOOL EQUIPPED WITH IT | |
| DE3930245A1 | CLUTCH DEVICE FOR MODULAR TOOLING SYSTEMS | |
| DE3838071A1 | Milling tool | |
| US4651600A | Interchangeable cutting die or tool head arrangement | |
| DE3600466A1 | CHUCK FOR ROTATING TOOLS | |
| DE3200191A1 | "MILLING TOOL" | |
| DE3144101A1 | Chuck for drilling machines or the like | |
| DE3048274A1 | DRILL CHUCK |