| # | Industry | |
|---|---|---|
| #1 | Basic materials chemistry | |
| #2 | Machine tools | |
| #3 | Mechanical elements | |
| #4 | Thermal processes | |
| #5 | Civil engineering | |
| #6 | Control |
| # | Technology | |
|---|---|---|
| #1 | Acetylene production | |
| #2 | Soldering, welding and flame cutting | |
| #3 | Burners | |
| #4 | Venting or aerating devices | |
| #5 | Gas holders | |
| #6 | Fire-fighting | |
| #7 | Systems controlling non-electric variables |
| # | Name | Total Patents |
|---|---|---|
| #1 | Vogel Walter | 7 |
| #2 | Zahn Otto | 5 |
| #3 | Becker Ernst | 3 |
| #4 | Oidtmann Hermann | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1149216B | Diaphragm-controlled pressure reducing valve with a closing piece acted upon by the inflow pressure in the closing direction | |
| DE543547C | Double valve for welding torch | |
| DE513612C | Process and apparatus for developing acetylene from carbide dust | |
| DE344865C | Double valve for welding torches and similar, influenced by a common lever. like |