| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 12 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Packaging and shipping | |
| #3 | Basic materials chemistry | |
| #4 | Chemical engineering | |
| #5 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Machines for making railways | |
| #2 | Transport or storage devices | |
| #3 | Separation | |
| #4 | Shafts | |
| #5 | Steam traps | |
| #6 | Gas, coke and tar production |
| Publication | Filing date | Title |
|---|---|---|
| DE380997C | Drain regulator |