Guspro Inc. was established in 1932 as the Canadian division of Sunnen Products Company, headquarted in St. Louis, MO. For over 50 years, Guspro distributed and manufactured Sunnen honing products, including machines, abrasives, and tooling. In 1980, Canadian manufacturing for Sunnen Products was set to wind down, and so Guspro Inc. began a transformation. Though Guspro remains the exclusive distributor of Sunnen Products in Canada, today the company is comprised of four unique but complementary divisions.

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