AU1156670A
(en )
1971-08-19
Improvements in or relating to percussion drill bit
AU1189270A
(en )
1971-09-02
Improvements in or relating to percussion drill bit
ZA702626B
(en )
1971-01-27
Retractable drill bits
IL42761A0
(en )
1973-10-25
An improvement in or relating to twist drills
ZA702964B
(en )
1971-12-29
Improvements in or relating to organic compounds
IL35498A0
(en )
1970-12-24
Improvements in or relating to twist drills
ZA702211B
(en )
1971-09-29
Improvements in or relating to stud-welding
ZA704193B
(en )
1972-01-26
Improvements in or relating to organic compounds
ZM2975A1
(en )
1976-01-21
Improvements in or relating to drill bits
ZA708723B
(en )
1971-10-27
Improvements in or relating to mining
ZA696055B
(en )
1971-02-24
Improvements in or relating to drill bits
ZA697390B
(en )
1971-01-27
Improvements in or relating to boring
IE34834B1
(en )
1975-09-03
Improvements in or relating to the drilling or cutting of earth strata
ZA708724B
(en )
1971-10-27
Improvements in or relating to the drilling or cutting of earth strata
ZA704439B
(en )
1971-03-31
Improvements in or relating to organic compounds
AU439742B2
(en )
1973-08-23
Improvements in or relating to drill bit and inserts therefor
IL32475A0
(en )
1969-08-27
Improvements in drill supports
ZA7277B
(en )
1973-03-28
Improvements in or relating to rock drills
ZA704629B
(en )
1971-03-31
Improvements in or relating to organic compounds
ZA695521B
(en )
1971-02-24
Improvements in or relating to reamers
ZA708331B
(en )
1971-09-29
Drill bit
ZA691534B
(en )
1971-01-27
Improvements in or relating to toolholders
ZA702157B
(en )
1971-04-28
Improvements in or relating to shank drills
AU4881769A
(en )
1970-07-09
Improvements in rock drill bits
AU5393769A
(en )
1970-10-29
Improvements in rock drill bits