Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19681652532external-prioritypatent/DE1652532B1/de
Application filedfiledCritical
Publication of BE729464ApublicationCriticalpatent/BE729464A/xx
E21C37/00—Other methods or devices for dislodging with or without loading
E21C37/04—Other methods or devices for dislodging with or without loading by devices with parts pressed mechanically against the wall of a borehole or a slit
Landscapes
Engineering & Computer Science
(AREA)
Mining & Mineral Resources
(AREA)
Life Sciences & Earth Sciences
(AREA)
General Life Sciences & Earth Sciences
(AREA)
Geochemistry & Mineralogy
(AREA)
Geology
(AREA)
Constituent Portions Of Griding Lathes, Driving, Sensing And Control
(AREA)