Issued the same year Rufus Dutton received his U.S. patent for a “Machine for Grinding Mowing-Machine Knives” (No. 342,290, May 18, 1886), this circular reflects the first wave of dealer-level promotion of Dutton’s then-new water-cooled, two-bevel knife-grinding design—features widely cited in later trade adoption. Surviving 19th-century dealer pieces for specific.....