LandOfFree - US Patents - Listing for Boring or penetrating the earth

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Electrically sequenced tractor

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Electrically sequenced tractor

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Electrically sequenced tractor

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Electrically sequenced tractor

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Electrically sequenced tractor

Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...

Electrically sequenced tractor

Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall

Electro-hydraulically controlled tractor

Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall

Electro-hydraulically controlled tractor

Boring or penetrating the earth – Below-ground impact members – Fluid-operated

Electro-mechanical drilling jar

Boring or penetrating the earth – With below-ground tool drive prime mover – Electric

Electromagnetic drilling apparatus

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...

Electromagnetic drilling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – Electric

Electromagnetic drilling apparatus and method

Boring or penetrating the earth – With signaling – indicating – testing or measuring

Electromagnetic gap sub assembly

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore

Electromagnetically accelerated impact oil well drill

Boring or penetrating the earth – With signaling – indicating – testing or measuring

Electromagnetically determining the relative location of a...

Boring or penetrating the earth – With signaling – indicating – testing or measuring

Electronic depth indicator for hydraulic drilling machines

Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...

Electronic roll indexing compensation in a drilling system...

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight

Electronically controlled earth drilling rig

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight

Electronically controlled earth drilling rig