SU760900A3
(en )
1980-08-30
Method of assembly of drilling cutter bit
ZA751532B
(en )
1976-02-25
Hydraulic drill in particular a rock drill
ZA722918B
(en )
1973-02-28
Anti-tracking earth boring drill
ZM6776A1
(en )
1977-09-21
A ring drilling rig
ZA758052B
(en )
1976-12-29
Hydraulic rock drill
NO741356L
(en )
1974-10-18
Drilling device with replaceable core drill and central part of drilling tools
GB1558172A
(en )
1979-12-19
Drilling rigs
HU173189B
(en )
1979-03-28
Auger drill bit
CA994750A
(en )
1976-08-10
Drilling bits for boring holes and wells
CA978762A
(en )
1975-12-02
Pile mounted drilling rig and method
ZA774637B
(en )
1978-06-28
Rock drilling method
JPS5329203A
(en )
1978-03-18
Rock drilling bit
ZA718661B
(en )
1972-09-27
Improved large diameter earth boring bit
ZA744967B
(en )
1975-08-27
Segmented earth boring drill bit
ZA731183B
(en )
1973-11-28
Rock drill bit and sleeve assembly and bit installation method
ZA735558B
(en )
1974-10-30
Method of drilling with a drop bit borehole drilling machine and a drop bit
JPS522804A
(en )
1977-01-10
Rock drilling bit
CH608859A5
(en )
1979-01-31
Connection between rock drill and drilling machine
GB1415137A
(en )
1975-11-26
Deep hole drill
CA933146A
(en )
1973-09-04
Method of drilling and casing a large diameter borehole
CA994321A
(en )
1976-08-03
Rotary bit for hydraulically drilling holes into underground formations
ZA715460B
(en )
1972-04-26
Earth boring machine with a pivotal head
AU3750471A
(en )
1973-07-05
Underground drilling machine
ZA739733B
(en )
1974-08-28
Borehole drilling machine
ZA733473B
(en )
1974-12-24
Borehole drilling machine