Vertical Two-Stage Feather Valve Air Compressors--Installation and Operation, 1924, Box: Series 11, Box 2, Folder: 12. Ward Engineering Company Archives and Manuscripts, A&M 2298. West Virginia and Regional History Center.
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Vertical Two-Stage Feather Valve Air Compressors--Installation and Operation, 1924, Box: Series 11, Box 2, Folder: 12. Ward Engineering Company Archives and Manuscripts, A&M 2298. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/144438 Accessed December 23, 2024.