Inventor
OKAMURA KENKO
JP3 patents
Patents
3 patentsUS6109305AAug 29, 2000
Double walled pipe, jacking method and pipe end structure of leading pipe
KAWASAKI STEEL CO8 citations71
US5615976AApr 1, 1997
Double walled pipe, jacking method and pipe end structure of leading pipe
KAWASAKI STEEL CO10 citations71
US6004073ADec 21, 1999
Double walled pipe, jacking method and pipe end structure of leading pipe
KAWASAKI STEEL CO0 citations50