Inventor
VAN HOUWELINGEN MARK K
US3 patents
Patents
3 patentsUS6516899B2Feb 11, 2003
Method and apparatus for directional boring under mixed conditions
EARTH TOOL CO LLC6 citations72
US6439319B1Aug 27, 2002
Method and apparatus for directional boring under mixed conditions
EARTH TOOL CO LLC8 citations72
US6390207B2May 21, 2002
Method and apparatus for directional boring under mixed conditions
EARTH TOOL CO LLC10 citations72