|
US5158147A
|
|
Auger cutter head
|
|
US4993500A
|
|
Automatic drive hammer system and method for use thereof
|
|
US4081040A
|
|
Method and apparatus for thin-walled tube sampling of soils
|
|
US3889765A
|
|
Earth sampling apparatus
|
|
CA975348A
|
|
Earth sampling apparatus
|
|
CA951130A
|
|
Hollow auger driver coupling
|
|
US3794127A
|
|
Hollow auger-driver coupling
|
|
US3651876A
|
|
Quick acting drive cap assembly
|
|
US3664444A
|
|
Air drilling method using controlled split stream
|
|
US3553980A
|
|
Kelly bar coupling
|
|
US3515228A
|
|
Drilling apparatus
|
|
US3515824A
|
|
Safety switch
|
|
FR1427518A
|
|
Hollow auger
|
|
US3301338A
|
|
Hollow auger coupling
|
|
US3178210A
|
|
Hollow auger
|
|
US3232360A
|
|
Bore positioning method and apparatus
|
|
US3180438A
|
|
Core sample apparatus
|
|
US3215210A
|
|
Core sample apparatus
|
|
CA897226A
|
|
Safety switch
|
|
CA727479A
|
|
Core sample apparatus
|
