1839
John C. Burr came to Beloit in company with Alfred Field and started a tin shop.
BeloitGrade A · 1 independent source
The evidence
“JOHN C BURR, merchant; born in Hartford, Conn., in 1816 ; came to Beloit in May, 1839, in company with Alfred Field, one of the first settlers in the county ; they went into partnership, and started a tin shop, also carried a stock of stoves ; continued together in business two years, and then Mr. Burr enlarged the business and carried, a full stock of hardware, tools, agricultural implements, etc.”
1879-history-of-rock-county/18-bios-beloit.md, PDF p. 733 / book p. 737
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources