Senders: Pratt & Whitney
- Franklin G. Whitmore for Pratt & Whitney to SLC, 13 February 1889 · Hartford, Conn. · UCLC44373 CU-MARK
- G. A. Bates for Pratt & Whitney to SLC, 12 September 1889 · Hartford, Conn. · UCLC44671 CU-MARK
- R. F. Blodgett for Pratt & Whitney to SLC, 4 October 1890 · Hartford, Conn. · UCLC45236 CU-MARK
- R. F. Blodgett and Pratt & Whitney to SLC, 10 January 1891 · Hartford, Conn. · UCLC38977 ViU
- W. M. Storrs and Pratt & Whitney to SLC, 24 April 1901 · Hartford, Conn. · UCLC33247 ViU
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