History of Martin Maurer of St. Louis

Martin Maurer operated a hardware store and machine shop in St. Louis, Missouri from 1875 to at least 1895. He invented and patented a stamped steel concrete edger and a groover in 1891,  and St. Louis city directories in the early 1890s show that he specialized in masonry tools. Maurer developed and manufactured a line of concrete tools which were still being sold in the 1904 catalog of Walter A. Zelnicker Supply Co., a St. Louis hardware wholesaler.

I have been unable to find this Martin Maurer in US Census records to get his birth date, or to find a death record. There is a mention of  him in the Cassville, MO newspaper 3 Oct. 1895, stating that he was to move to Louisiana. This could mean the state or Louisiana, MO.

Beginning in 1903, a Martin Maurer of Pueblo, Colorado received at least 8 patents for scales and improvements to scales. The first one used one of the same patent attorneys as the concrete tool patents. It may be the same person, but I have no verification of that.

US Patent 460,644  Device for blocking off artificial-stone pavements
US Patent 460,645  Device for rounding and smoothing the edges of artificial-stone gutters

Cassville, MO newspaper, 3 Oct. 1895