Shortage of twist drills has resulted in development, by London Midland and Scottish Railway, of method of repairing broken drills by atomic hydrogen arc process. (See also Engineer v 175 n 4552 Apr 9 1943 p 293)
Repair of drills by welding
Engineering
Engineering ; 155 , n 4032
1943
Aufsatz (Zeitschrift)
Englisch
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