Inventor
ZENBAYASHI KATSUAKI
JP3 patents
Patents
3 patentsUS4350548ASep 21, 1982
Method and apparatus for providing the inner surface of a pipe line with a lining
TOKYO GAS CO LTD94 citations94
US4334943AJun 15, 1982
Method for smoothly evaginating a tubular material under pressure
TOKYO GAS CO LTD55 citations94
US4882470ANov 21, 1989
Boring device for opening passages to branch portions of a lined main pipe line
TOKYO GAS CO LTD2 citations57