Taliaferro P. Shaffner and William M. Shaffner - Assignment, of reissues of original letters patent No. 50617, by William M. Shaffner to the U.S. Blasting Oil Co., with certain exceptions: reserving his rights for Michigan for ten years and license to Marquette Nitro Glycerine Co., with appended receipt of record, U.S. Patent Office, 22 May 1873, impressed seal and stamp, 1873 April 10, LMSS-V-III.-E., Box: 51. E.I. du Pont de Nemours & Co. records, LMSS-V. Manuscripts and Archives. https://findingaids.hagley.org/repositories/3/archival_objects/297874 Accessed May 17, 2025.