Inventor
SAKUMA YASUZI
JP4 patents
Patents
4 patentsUS4770105ASep 13, 1988
Piping travelling apparatus
HITACHI LTD78 citations95
US4918283AApr 17, 1990
Method of and apparatus for conducting plasma welding
HITACHI LTD31 citations91
US4644791AFeb 24, 1987
Moving apparatus for a hollow curved pipe-arrangement and an operating method in the pipe-arrangement by using the moving apparatus
HITACHI LTD20 citations80
US4788409ANov 29, 1988
Method of and apparatus for automatically conducting all position plasma welding of pipes
HITACHI LTD11 citations72