Inventor
KOYAMA TAKAICHI
JP4 patents
Patents
4 patentsUS4144992AMar 20, 1979
Method for controlling an automatic pipe welder
HITACHI LTD75 citations94
US4311556AJan 19, 1982
Method and system for inspection of inside of nuclear reactor vessel
HITACHI LTD78 citations93
US4440339AApr 3, 1984
Method of repairing housing of control rod driving system
HITACHI LTD39 citations90
US4262517AApr 21, 1981
Method of correcting distorted pipe end
HITACHI LTD5 citations61