Patent Search Report (Part 1), Box: 87, Folder: F177. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Patent Search Report (Part 1), Box: 87, Folder: F177. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/91040 Accessed September 09, 2024.
