ZA742501B
(en )
1976-02-25
Improvements in or relating to accelerometers
ZA747725B
(en )
1976-07-28
Improvements in or relating to diamonds
ZA761136B
(en )
1977-02-23
Improvements in or relating to drills
AU7174274A
(en )
1976-01-29
Blastings in rock formation 014
IL47302A0
(en )
1975-07-28
An improvement in or relating to twist drills
ZA751884B
(en )
1976-02-25
Improvements in or relating to tennis-rackets
ZA764191B
(en )
1977-07-27
Improvements in or relating to coal mining
ZA763724B
(en )
1977-05-25
Improvements in or relating to percussion drills
ZM2975A1
(en )
1976-01-21
Improvements in or relating to drill bits
ZA761568B
(en )
1977-03-30
Improvements in or relating to rock strata reinforcement
JPS51151201A
(en )
1976-12-25
Doubleepiston rock drill
ZA745552B
(en )
1975-12-31
Improvements in or relating to rock drills
ZA745550B
(en )
1975-12-31
Improvements in or relating to rock drills
ZA745551B
(en )
1975-12-31
Improvements in or relating to pneutmatic rock drills
ZM11075A1
(en )
1976-10-21
Improvements in or relating to drilling machines
ZA745553B
(en )
1975-12-31
Improvements in or relating to pneumatic rock drills
ZA745684B
(en )
1975-12-31
Improvements in rock drills
ZA754187B
(en )
1976-11-24
Improvements in or relating to rock drills
ZA7278B
(en )
1973-03-28
Improvements in or relating to rock drills
ZA757476B
(en )
1976-11-24
Drill unit
AU487048B2
(en )
1977-02-03
Improvements in or relating to drilling machines
ZA76168B
(en )
1977-07-27
Improvements in or relating to rock drills
AU8347475A
(en )
1977-02-03
Improvements in or relating to drilling machines
ZA747049B
(en )
1976-05-26
Improvements in or relating to the cutting of slots in rock
ZA747800B
(en )
1976-03-31
Improvements in or relating to mining equipment