|
US3012546A
|
|
Hydraulic props, particularly pit props
|
|
US3058341A
|
|
Force measuring device for determining the stresses upon the frameworks in underground excavations and the like
|
|
GB875004A
|
|
Improvements relating to force measuring devices
|
|
GB862802A
|
|
Lagging frameworks for branch junctions or intersections in mining roadway systems
|
|
GB835325A
|
|
Improvements in or relating to rigid joints for mine roof or mine wall supporting structures
|
|
GB864790A
|
|
Improvements in fishplate connections for segments of supporting systems, especiallyof mine galleries
|
|
GB860195A
|
|
Improvements in or relating to walling for use in mine-workings
|
|
GB858902A
|
|
Improvements in or relating to hydraulic pumps
|
|
GB858901A
|
|
Improvements in or relating to hydraulic pumps
|
|
GB856254A
|
|
A new or improved method and apparatus for the production of supporting segments
|
|
GB820038A
|
|
Yielding connection for inter-nesting flanged channel section members
|
|
GB853868A
|
|
New and improved apparatus for removing the side segm of mine gallery prop frames
|
|
GB798822A
|
|
Improvements relating to roof-supporting structures at underground workfaces
|
|
GB836419A
|
|
Improvements in lagging members for underground gallery-support systems
|
|
CA639551A
|
|
Structural connection
|
|
CA656728A
|
|
Hydraulic props, particularly pit props
|
|
CA609575A
|
|
Process and installation for the heat treatment of steel work pieces
|
|
CA630601A
|
|
Force measuring device
|
