| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United Kingdom | 1 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Shaping clay | |
| #2 | Shafts | |
| #3 | Hydraulic engineering | |
| #4 | Pipes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Boessner Josef | 9 |
| #2 | Josef Boessner | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US3328971A | Shield tunneling process and machine for constructing a tunnel | |
| GB997796A | Improvements in or relating to formwork |