| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 5 | |
| #2 | Austria | 3 | |
| #3 | France | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Cycle brakes | |
| #2 | Springs | |
| #3 | Wheelchairs and sledges | |
| #4 | Clutches and brakes |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ludwig Hans | 2 |
| #2 | Hans Ludwig | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB258906A | Improvements in or relating to drivers for free-wheel hubs | |
| GB251130A | Improvements in brake hubs particularly suitable for power vehicles | |
| DE465906C | Freewheel hub |