Calumet & Hecla, Inc. Wolverine Tube Division
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| referencedIn | Michigan College of Mining and Technology. Copper Fittings Research Project Patent Records, 1933-1961 1934-1956. | Michigan Technological University, J.R. Van Pelt & Opie Library; Michigan Tech |
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| associatedWith | Michigan College of Mining and Technology | corporateBody |
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