| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | Canada | 4 | |
| #3 | United Kingdom | 2 | |
| #4 | France | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Chemical engineering | |
| #5 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Dredging | |
| #2 | Servomotors | |
| #3 | Separation | |
| #4 | Unspecified technologies | |
| #5 | Motor vehicles | |
| #6 | Foundations and excavations | |
| #7 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Austin Ellsworth W | 3 |
| #2 | Rodler Waldo E | 2 |
| #3 | Choate Roy E | 2 |
| #4 | Shimerda Carrol D | 1 |
| #5 | Chloe Cox Alonzo | 1 |
| #6 | Pearson Herbert H | 1 |
| #7 | Rockwell Harvey W | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2402449A | Hydraulic system | |
| US2394428A | Excavator | |
| US2242808A | Earth tamper | |
| US2242807A | Oil filter | |
| GB511582A | Earth moving device | |
| GB509058A | Improvements in or relating to earth-moving apparatus | |
| US1938869A | Four-way valve | |
| CA344102A | Earth moving device | |
| CA411010A | Snow plough | |
| CA347552A | Wagon | |
| CA347044A | Earth moving device |