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Courtesy of UC Davis, University Archives
http://www.oac.cdlib.org/ark:/13030/c8s183ns/?order=1
Title:
Lincoln Electric Company's exhibit of welding equipment and the demonstration of how to face harden track rollers for crawler tractors was a big attraction at the University of California Farm Machinery Conference at Davis.
Date:
1942 January 9-10
Contributing Institution:
UC Davis, University Archives