|
GB418020A
|
|
Improvements in and relating to electrically-driven drills
|
|
GB386049A
|
|
Improvements in and relating to drilling machines
|
|
GB337281A
|
|
Improvements in and relating to mining machines
|
|
GB279919A
|
|
Improvements in and connected with coal cutting and like machines
|
|
GB268189A
|
|
Improvements in and connected with coal cutting and like machines
|
|
GB241110A
|
|
Improvements in or relating to mining machines
|
|
GB240733A
|
|
Improvements in coal cutting machines of the chain type
|
|
GB240614A
|
|
Improvements in connection with coal-cutting machines
|
|
GB220073A
|
|
An improved reciprocating engine applicable as a motor, pump, exhauster, or compressor
|
|
GB207299A
|
|
Improvements in connection with coal-cutting and like machines
|
|
GB204861A
|
|
Variable-speed friction gearing
|
