|
US3139149A
|
|
Rock drilling tool
|
|
US3140749A
|
|
Wedge inserts for drill bit
|
|
GB884502A
|
|
Rock drilling tool
|
|
US2764387A
|
|
Rock drill adapted to inject fluid into a bore hole
|
|
GB739177A
|
|
Improvements in or relating to rock drills
|
|
US2815933A
|
|
Detachable drill bit insert for rock boring tools
|
|
GB758084A
|
|
Improvements in rock drills
|
|
GB692373A
|
|
Improvements in or relating to drill bits for boring rock or like materials
|
|
US2648524A
|
|
Mining trepan
|
|
GB641010A
|
|
Mining trepan
|
|
US2599167A
|
|
Scraping out device for mining boreholes
|
|
IE16176L
|
|
Lime etc. furnaces
|
|
US2280571A
|
|
Furnace
|
|
GB539739A
|
|
Improvements in or relating to furnaces
|
|
GB511946A
|
|
Improvements in apparatus for feeding ovens, furnaces or the like
|
