Copper-Bar Semi-Automatic Welding Process: A German Invention called the Elin-Hafergut Arc-Welding Procedure. Document Details Document Type Technical Report Publication Date Jun 30, 1947 Accession Number ADA953574 Entities People F. W. Meyers Jr Tags DTIC Thesaurus Topics Arc Welding Automatic Electric Welding Fusion Welding Inventions Welding