Add to ORKGPatent for an improved kind of drill bit that is more durable against rock. The bit's cutting rollers have a frusto-conical shape, and are also detachable
Patent for new and improved well-drilling machinery. This design "is to make a well-drilling machine...
Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the ro...
Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the ro...
Patent for a new and improved drill. This design consists in "the combination, with the main shaft c...
Patent for improvements to rotary boring drills that enable a drill to be assembled and disassembled...
Patent for an expansion bit for a well-drilling apparatus that can be "adjusted and removed without ...
Patent for an Artesian or oil well drilling apparatus that has a detachable drill-bit in its tubing ...
Patent for an invention relating to "boring drills of the type having roller forms of cutters" (line...
Patent for "Improvements in Combination Drill-Bits and Drill-Shanks" (lines 6-7) including illustrat...
Patent for rotary boring drill with explanation and the accompanying illustrations
Patent for improvements in the construction and design of well-drilling machines
Patent for "drills for the cutting or drilling of stone, and has for its primary object the taking u...
In most blasting, a uniform powder factor is required. It is the position of the loaded portions of ...
Patent for a new and improved well drill. This design "consists in a novel construction of a tool fo...
Patent for a new and improved dental-drill attachment. This design consists in "the combination, wit...
Patent for new and improved well-drilling machinery. This design "is to make a well-drilling machine...
Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the ro...
Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the ro...
Patent for a new and improved drill. This design consists in "the combination, with the main shaft c...
Patent for improvements to rotary boring drills that enable a drill to be assembled and disassembled...
Patent for an expansion bit for a well-drilling apparatus that can be "adjusted and removed without ...
Patent for an Artesian or oil well drilling apparatus that has a detachable drill-bit in its tubing ...
Patent for an invention relating to "boring drills of the type having roller forms of cutters" (line...
Patent for "Improvements in Combination Drill-Bits and Drill-Shanks" (lines 6-7) including illustrat...
Patent for rotary boring drill with explanation and the accompanying illustrations
Patent for improvements in the construction and design of well-drilling machines
Patent for "drills for the cutting or drilling of stone, and has for its primary object the taking u...
In most blasting, a uniform powder factor is required. It is the position of the loaded portions of ...
Patent for a new and improved well drill. This design "consists in a novel construction of a tool fo...
Patent for a new and improved dental-drill attachment. This design consists in "the combination, wit...
Patent for new and improved well-drilling machinery. This design "is to make a well-drilling machine...
Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the ro...
Roller cone drill bits are used in drilling larger diameter wells. The drilling efficiency of the ro...