MX151951A
(en )
1985-05-15
IMPROVEMENTS IN A ROTARY DRILL FOR WELL DRILLING
ES495478A0
(en )
1981-06-01
IMPROVEMENT IN A DRILL FOR ROCK DRILLING.
MX148390A
(en )
1983-04-18
IMPROVEMENTS TO ROTARY DRILL FOR ROCK
ES494018A0
(en )
1981-09-01
ROCK DRILL HAMMER
MX158732A
(en )
1989-03-08
IMPROVEMENTS TO DRILL FOR DRILLING METALS
MX155205A
(en )
1988-02-02
IMPROVEMENTS TO A HYBRID DRILL FOR DRILLING DEEP WELLS
MX151243A
(en )
1984-10-24
IMPROVEMENTS IN ROTATING DRILL FOR DRILLING WELLS
MX156964A
(en )
1988-10-18
IMPROVED METHOD FOR MAKING AN INSERTION IN A WEAR-RESISTANT DRILL FOR ROCK DRILLING
MX152904A
(en )
1986-06-27
IMPROVEMENTS TO MACHINE TO DRILL SHIELD AND SIMILAR TUNNELS
MX152350A
(en )
1985-07-02
IMPROVEMENTS TO A DRILLING TOOL, FOR DEEP DRILLING
ATA218579A
(en )
1981-01-15
INTERCHANGEABLE DRILL BIT FOR A ROCK DRILL DRILL AND DRILL BIT APPLICABLE TO ALL STONES
IT1140564B
(en )
1986-10-01
PERCUSSION DRILLING HAMMER
MX147921A
(en )
1983-02-02
ROTARY DRILL FOR IMPROVED ROCK
MX147585A
(en )
1982-12-15
IMPROVEMENTS IN ROCK DRILL BIT
IT8567004A0
(en )
1985-01-03
DRILL CHUCK FOR PERCUSSION DRILLING
MX158268A
(en )
1989-01-18
IMPROVEMENTS TO ELASTIC METAL SHUTTER FOR A ROTATING CONE DRILL FOR ROCK
DE2963533D1
(en )
1982-10-07
Rotary rock drill bit
SE7800807L
(en )
1978-08-05
HYDRAULICALLY DRIVEN ROCK DRILL
MX148814A
(en )
1983-06-22
IMPROVEMENTS TO A ROTATING ROCK DRILL AND METHOD TO DO THE SAME
GB2047308B
(en )
1982-11-17
Drill bit for well drilling
JPS539201A
(en )
1978-01-27
Rock drill bit for airrdriven impact hammer
ES273313Y
(en )
1984-06-01
A DRILLING ARRANGEMENT INTENDED FOR USE IN ROCK DRILLING FOR PERCUSSION
ZA794072B
(en )
1980-08-27
A drilling machine,especially a rock drill
ATA779178A
(en )
1980-07-15
IMPACT DRILL BIT
GB2025490B
(en )
1982-09-29
Shock-absorbing tool for a well drilling string