John D. Barr

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Archive | 1988

Manufacture of rotary drill bits

Malcolm Roy Taylor; John D. Barr; John R. Smart

Archive | 1986

Drag bit and cutters

John D. Barr

Archive | 1986

Drill bit and method of manufacture

John D. Barr; Haydn R. Lamb

Archive | 1987

Drill bit and cutter therefor

John D. Barr; John M. Fuller

Archive | 1985

Drag-type drill bit

Lot W. Short; John D. Barr

Archive | 1988

Relating to rotary drill bits

John D. Barr; Michael Thomas Wardley

Archive | 1988

Cutting structure and rotary drill bit comprising such a structure

John D. Barr; Malcolm Roy Taylor; Terry R. Matthias; Michael Thomas Wardley; Michael Colin Regan

Archive | 1984

Drill bit cutter

Terry R. Matthias; John D. Barr

Archive | 1986

Improved drag type drill bit

Lot W. Short; John D. Barr

Archive | 1985

Improved drill bit and cutter therefor

Terry R. Matthias; John D. Barr; Malcolmn Roy Taylor

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NL Industries, Inc.

Archive Network Publication Hotspot Collaboration

Network

Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot

Dive into the research topics where John D. Barr is active.

Publication

Featured researches published by John D. Barr.

Manufacture of rotary drill bits

Drag bit and cutters

Drill bit and method of manufacture

Drill bit and cutter therefor

Drag-type drill bit

Relating to rotary drill bits

Cutting structure and rotary drill bit comprising such a structure

Drill bit cutter

Improved drag type drill bit

Improved drill bit and cutter therefor

Collaboration

Dive into the John D. Barr's collaboration.