| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 8 | |
| #2 | Austria | 4 | |
| #3 | Switzerland | 2 | |
| #4 | United Kingdom | 2 | |
| #5 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Geophysics | |
| #2 | Analysing materials |
| # | Name | Total Patents |
|---|---|---|
| #1 | Aardlagenonderzoek N V Erda Ma | 2 |
| #2 | Ambronn Richard | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB210801A | Improvements in or relating to electrical arrangements for exploring the subsoil | |
| GB204309A | A process for facilitating discovery of mineral or other deposits | |
| CA266332A | Equipotential lines determining device |