| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Belgium | 5 | |
| #2 | Germany | 2 | |
| #3 | Netherlands | 2 | |
| #4 | France | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Japan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Foundations and excavations | |
| #2 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Verstraeten Alexander Julien | 2 |
| #2 | Arekisandaa Jiyurian Baasutore | 1 |
| Publication | Filing date | Title |
|---|---|---|
| BE881069A | Ground drill and drill head used therein | |
| DE2936060A1 | Earth borer for concrete piles - has set of serrated teeth joining drill tube to drill head to transmit large torques | |
| NL7608927A | Screw threaded foundation pipe - has spiral blades at intervals in axial direction greater than pitch of spiral | |
| DE2303767A1 | METHOD AND APPARATUS FOR MAKING A PILE IN THE SOIL AND PILE MANUFACTURED USING THIS METHOD |