Improvements relating to rotary bits for drilling coal and rock
GB569021A
Improvements in electric indicating devices applicable to gate end boxes and the like for use in mines
GB564399A
Improvements in or relating to dirt-excluding devices for bearings
GB563546A
Improvements relating to jigs for use in grinding drill bits
GB559772A
Improvements relating to compressed-air-driven drills
US2372920A
Valve for pneumatic tools
GB547928A
Improvements relating to pneumatic tools
GB538778A
Improvements relating to pneumatic tools
GB529937A
Improvements relating to coal and rock cutters of the chain type
GB525893A
Improvements relating to coal face conveyors
GB518747A
Improvements relating to rock boring bits
GB518235A
Improvements relating to housings for ball and roller bearings
GB518492A
Improvements relating to rollers for endless band conveyors
GB500155A
Improvements in or relating to cable connexion sockets or glands for use with portable electric machines such as are used in mines and the like
GB506215A
Improvements relating to rollers for endless band conveyors
GB500147A
Improvements relating to rotary bits for rock and like drilling
GB512932A
Improvements in or relating to the application of power to hand tools such as drilling machines, coal cutters and the like and mechanism for operating against varying loads
GB479853A
Improvements in or relating to portable drilling machines
