ZA767719B
(en )
1977-11-30
Improvements in or relating to rock drilling and bolting gear
HK24782A
(en )
1982-06-18
Improvements in drill units
JPS5272302A
(en )
1977-06-16
Rock drill
MY7900177A
(en )
1979-12-31
Improvements in or relating to mineral jig
HK36082A
(en )
1982-08-20
Improvements in or relating to hand tools
HK24982A
(en )
1982-06-18
Improvements in or relating to portable drills
ZA777581B
(en )
1979-05-30
Improvements in or relating to rock drilling rigs
ZA761136B
(en )
1977-02-23
Improvements in or relating to drills
HK36182A
(en )
1982-08-20
Improvements in or relating to hand tools
ZA764191B
(en )
1977-07-27
Improvements in or relating to coal mining
ZA763724B
(en )
1977-05-25
Improvements in or relating to percussion drills
HK31179A
(en )
1979-05-18
Improvements in or relating to safes
ZA761568B
(en )
1977-03-30
Improvements in or relating to rock strata reinforcement
HK65984A
(en )
1984-08-31
Improvements in or relating to pipe cutters
ZA751175B
(en )
1976-01-28
Improvements in or relating to drill bits
ZA754187B
(en )
1976-11-24
Improvements in or relating to rock drills
ZA766075B
(en )
1977-09-28
Rock drill
CH607779A5
(en )
1978-10-31
Rock drill
ZA76168B
(en )
1977-07-27
Improvements in or relating to rock drills
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
AU494155B2
(en )
1978-07-13
Improvements in or relating to percussion drills
ZA755963B
(en )
1976-12-29
Improvements relating to rock boring
ZA78291B
(en )
1978-12-27
Improvements in or relating to drill bits