Senders: Hartford Engineering
- Hartford Engineering per Joseph M. Stoughton to SLC, 29 December 1882 · Hartford, Conn. · UCLC41416 CU-MARK
- Hartford Engineering Co. to SLC, 11 July 1883 · Hartford, Conn. · UCLC41599 CU-MARK
- Hartford Engineering Co. to SLC, 17 July 1883 · UCLC41605 CU-MARK
- Edward M. Bunce for Hartford Engineering to SLC, 2 December 1887 · Hartford, Conn. · UCLC43843 CU-MARK
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