Procedure handbook of arc welding design and practice / The Lincoln Electric Co Shore scleroscope for measuring the hardness of metals : its application to the arts : in use throughout the world and adopted as the International … Salt bath quenching processes / by Harold J. Babcock Hearings before the subcommittee of the committee on appropriations, house of representatives, 81ste congress, 1st session, on the National Military Establishment Appropriation Bill for 1950 …