ZA733315B
(en )
1974-04-24
Improvements in or relating to connection elements
ZA731896B
(en )
1974-05-29
Improvements in or relating to ozonisers
ZA731352B
(en )
1973-11-28
Improvements in or relating to telephones
IL37497A0
(en )
1971-11-29
Improvements in or relating to pillars
ZA732966B
(en )
1974-06-26
Improvements in or relating to eartags
ZA734741B
(en )
1974-10-30
Improvements in or relating to extraction
ZA722898B
(en )
1973-06-27
Improvements in or relating to pipes
HK14679A
(en )
1979-03-30
Improvements in or relating to anchors
ZA737327B
(en )
1974-10-30
Improvements in or relating to mine brattices
ZA717446B
(en )
1972-09-27
Improvements in or relating to hydraulic shearing machine
ZA747590B
(en )
1975-12-31
Improvements in or relating to hydraulic linkages
ZA733375B
(en )
1975-01-29
Improvements in or relating to concrete pipes
ZA731854B
(en )
1974-01-30
Improvements in or relating to mine roof supports
ZM1673A1
(en )
1974-02-21
Improvements in or relating to building structures
ZA713437B
(en )
1972-01-26
Improvements in or relating to wellpoints for dewatering ground
HK46177A
(en )
1977-09-16
Improvements in or relating to building construction
ZA73566B
(en )
1973-10-31
Improvements in or relating to screens
ZA72172B
(en )
1973-09-26
Improvements in or relating to hydraulic props
ZA72171B
(en )
1973-03-28
Improvements in or relating to hydraulic props
ZA73483B
(en )
1973-10-31
Improvements in or relating to building methods
ZA731452B
(en )
1975-01-29
Improvements in or relating to rock-drilling machines
HK32579A
(en )
1979-05-25
Improvements in or relating to building methods
AU5670773A
(en )
1974-12-12
Improvements in or relating to hydraulic mechanisms
ZA725068B
(en )
1973-06-27
Improvements in or relating to hydraulic valves
ZA72322B
(en )
1972-11-29
Improvements in or relating to concrete