| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 10 | |
| #2 | Canada | 1 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Civil engineering | |
| #3 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Davis Bill G | 5 |
| #2 | Evans Clifford J | 4 |
| #3 | Boemer John H | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US4616806A | Valve | |
| US4261118A | Extruded locking device for digging tooth | |
| US4106468A | Pressure ratio valve | |
| US4100910A | Pressure ratio valve | |
| US4067348A | Fuel shut-off valve | |
| GB1533025A | Internal combustion engine starting system | |
| US3960131A | Internal combustion engine starting system | |
| US3606471A | Trenching devices | |
| US3319364A | Trenching machine side cutting attachment | |
| US3203188A | Method and apparatus for preparing a trench for a subsurface conduit line and for laying such a line | |
| US3041752A | Mounting means for digger teeth |