|
GB693689A
|
|
Improvements in work-holders
|
|
GB643790A
|
|
Improvements in or relating to drill-bits or drill-steels having hard metal tips suitable for rock drilling
|
|
GB637237A
|
|
Improvements in and relating to rock drills
|
|
IE16763L
|
|
Percussive drilling tools.
|
|
GB569428A
|
|
Improvements in percussive drilling tools
|
|
ES152071A1
|
|
Improvements in or relative to the manufacture of bits used in rock drills
|
|
GB539443A
|
|
Improvements in, and relating to, rock drills
|
|
DE667592C
|
|
Rock drill
|
|
GB485211A
|
|
Improvements in, and relating to, drill shafts and detachable bits for use with rock drills
|
