| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 12 | |
| #2 | Germany | 4 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Shafts | |
| #2 | Mining | |
| #3 | Safety devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Alacchi Georges | 5 |
| Publication | Filing date | Title |
|---|---|---|
| DE2346711A1 | Powered mine support with two-prop frames - floor and roof frames hinged by joined rods and linking cylinder | |
| DE2346710A1 | Powered mine support frame shifter - shifting rod hinged to beam and base unit, two cylinder shifting action | |
| US3890792A | Walking-props for mining galleries |