| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | France | 3 | |
| #3 | United Kingdom | 3 | |
| #4 | Israel | 3 | |
| #5 | United States | 3 | |
| #6 | South Africa | 3 | |
| #7 | Australia | 2 | |
| #8 | Canada | 2 | |
| #9 | Spain | 2 | |
| #10 | India | 2 | |
| #11 | Italy | 2 | |
| #12 | Sweden | 2 | |
| #13 | Austria | 1 | |
| #14 | Belgium | 1 | |
| #15 | Brazil | 1 | |
| #16 | Switzerland | 1 | |
| #17 | Czechoslovakia | 1 | |
| #18 | Ireland | 1 | |
| #19 | Netherlands | 1 |
| # | Industry | |
|---|---|---|
| #1 | Machine tools | |
| #2 | Machines | |
| #3 | Materials and metallurgy |
| # | Technology | |
|---|---|---|
| #1 | Turning | |
| #2 | Unspecified technologies | |
| #3 | Alloys |
| # | Name | Total Patents |
|---|---|---|
| #1 | Siddall K | 10 |
| #2 | Siddall Keith | 8 |
| #3 | Hibbert C | 2 |
| #4 | Kirk F | 2 |
| #5 | Howard M | 2 |
| #6 | Siddal Keith | 1 |
| #7 | Griffin Roger | 1 |
| #8 | Howard Michael Roi | 1 |
| #9 | Hibbert Charles | 1 |
| #10 | Kirk Frederick Arthur | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE2743503A1 | Chuck with spring segments locked by coned nut - has limited rotational travel of inner sleeve for easy release of tool | |
| US4065224A | Twist drills | |
| US3977807A | Twist drills | |
| GB1509912A | Twist drills | |
| GB1432546A | Twist drills | |
| GB1317188A | Twist drills | |
| IL30728D0 | Chuck with easily-detachable tool-carrying spindle |