"The Guardian Angel" roof sag measuring device (manufactured by Conkle, Inc.), ca. 1986, Box: 78, Folder: 3. J. Davitt McAteer Papers regarding Mining Safety, A&M 4219. West Virginia and Regional History Center.
Cite Item Description
"The Guardian Angel" roof sag measuring device (manufactured by Conkle, Inc.), ca. 1986, Box: 78, Folder: 3. J. Davitt McAteer Papers regarding Mining Safety, A&M 4219. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/112840 Accessed November 23, 2024.