| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 4 | |
| #2 | Belgium | 3 | |
| #3 | Switzerland | 3 | |
| #4 | France | 3 | |
| #5 | United Kingdom | 2 | |
| #6 | Sweden | 2 | |
| #7 | Austria | 1 | |
| #8 | Australia | 1 | |
| #9 | Brazil | 1 | |
| #10 | Canada | 1 | |
| #11 | Denmark | 1 | |
| #12 | Spain | 1 | |
| #13 | Israel | 1 | |
| #14 | Italy | 1 | |
| #15 | Netherlands | 1 | |
| #16 | Norway | 1 | |
| #17 | United States | 1 | |
| #18 | South Africa | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Civil engineering | |
| #3 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Nails | |
| #2 | Shafts | |
| #3 | Percussive tools | |
| #4 | Turning |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hoffmann H | 4 |
| #2 | Hoffmann Hendrik | 4 |
| #3 | Hendrik Hoffmann | 3 |
| #4 | Jansen Johan Wilhelm | 2 |
| #5 | Jansen J | 2 |
| #6 | Johan Wilhelm Jansen | 1 |
| #7 | W Jansen Johan | 1 |
| #8 | Jansen J W | 1 |
| #9 | Wilhelm Jansen Johan | 1 |
| #10 | Wilhelm Jansen Johann | 1 |
| Publication | Filing date | Title |
|---|---|---|
| IL38360D0 | Anchor bolt assembly | |
| AU3546871A | Anchor bolt | |
| ZA7107305B | Expansion bolt | |
| ES341015A3 | An improved hammer device. (Machine-translation by Google Translate, not legally binding) | |
| GB1123452A | Improvements in hammer drill attachments | |
| FR1470663A | Accessory for hammer drill | |
| FR1406865A | Improvements to a hollow plug for a hole drilled in a hard material | |
| GB1071556A | Improvements in and relating to screw-sockets for fixing in holes in hard material | |
| US3256946A | Hammer drill |