Valve and restrictor for gas torches

作者: George L Hammon

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参考文章(7)
Jr George R Spies, Cutting torch tip ,(1956)
James F Molloy, Combined valve and water silencer ,(1946)
Eli H Tjomsland, Kurt D Isecke, Cutting tip of composite construction ,(1948)
Lagonotte Gustave, Jouanet Henri, économiseur pour chalumeaux ,(1930)
Frederick N. Windsor, Underwater cutting torch ,(1946)