Drilling apparatus for producing drilled holes having an...

Details Drilling apparatus for producing drilled holes having an... Drilling apparatus for producing drilled holes having an...

B - Operations, Transporting

28

D

77/10

B28D 1/14 (2006.01) B23B 51/00 (2006.01)

Patent

CA 1311375

ABSTRACT OF THE DISCLOSURE A drilling apparatus for producing undercut drilled holes and comprising a drill shaft including a bulge portion located between a stop ring mounted on the drill shaft and a drilling head mounted at the free end of the drill shaft, and which narrows towards opposite ends of the drill shaft.

609211

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