ZA784382B
(en )
1979-09-26
Improvements in or relating to wall segments
ZA783493B
(en )
1979-06-27
Improvement in or relating to heterocyclic compounds
ZA7851B
(en )
1979-06-27
Improvements in or relating to pyrotechnic devices
ZA786956B
(en )
1980-03-26
Improvements in or relating to clotheslines
ZA791901B
(en )
1980-07-30
Improvements in or relating to mine working apparatus
ZA764191B
(en )
1977-07-27
Improvements in or relating to coal mining
ZA757015B
(en )
1976-10-27
Improvements in or relating to selfadvancing mine roof supports
ZA775699B
(en )
1979-04-25
Improvements in or relating to mine roof supports
ZA775250B
(en )
1979-04-25
Improvements in or relating to mine roof supports
ZA775348B
(en )
1979-05-30
Improvements in or relating to yieldable mine roof supports
ZA787331B
(en )
1980-11-26
Improvements in or relating to props for mine supports
ZA772031B
(en )
1978-07-26
Improvements in or relating to mine props
ZA761010B
(en )
1977-01-26
Improvements in or relating to mine roof supports
ZA776141B
(en )
1978-06-28
Improvements in or relating to tunnelling machines
ZA802821B
(en )
1981-05-27
Mine prop
ZA763597B
(en )
1977-09-28
Improvements in or relating to yieldable pit props
ZA763598B
(en )
1977-09-28
Improvements in or relating to yieldable pit props
DE2861017D1
(en )
1981-11-26
Improvements in or relating to decollators
DE2860615D1
(en )
1981-05-07
Improvements in or relating to ladders
ZA786010B
(en )
1979-10-31
Improvements in or relating to mineral mining machines
ZA78856B
(en )
1979-06-27
Improvements in or relating to mine roof supports
ZA784208B
(en )
1979-07-25
Improvements in or relating to footwear
ZA781634B
(en )
1979-02-28
Improvements in or relating to blasting machines
ZA777254B
(en )
1979-07-25
Improvements in or relating to pit props
ZA777257B
(en )
1978-12-27
Improvements in or relating to pit props