| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 20 | |
| #2 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Civil engineering | |
| #3 | Furniture and games | |
| #4 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Railway bodies | |
| #2 | Machines for making railways | |
| #3 | Crop agriculture | |
| #4 | Kitchen equipment | |
| #5 | Railway systems | |
| #6 | Dredging | |
| #7 | Domestic washing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Carl Doerr | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US1795110A | Multipart articulated reenforced-concrete sleeper | |
| US1799007A | Two-part reenforced-concrete sleeper | |
| DE374979C | Box dump truck |