Founded in 1913 as the Wisconsin Electric company by L.H.Hamilton and Chester H. Beach to make portable electrical-driven devices, the Company found a ready market and began to thrive. Following a change of name to the Dumore Corporation, in 1920 the first toolpost grinder was made as a temporary solution to grinding the bearing seats on armature and spindle shafts. As the shafts were finished on a lathe. By using a small portable hand grinder, clamped in the toolpost, a second set-up for grinding on a separate machine was avoided and, as the job remained in the lathe, accuracy was guaranteed. Today, more than one hundred years later, the Company still thrives and continues to manufacture - in the United States -  not only the traditional form of toolpost grinder, but also hand and flexible-shaft versions, a stand-alone high-speed drill press and automatic-feed drills and tappers.
Toolpost grinders were made with wheels ranging in diameter from 2 to 12 inches. The smallest, the Series 14 "Tom Thumb", was driven by a 1/14 h.p. motor and ran at 10,000 and 22500 r.p.m. The largest model was Series 25, this taking a wheel of up to 12 inches in diameter and powered by a 3.h.p. 3-phase motor that gave a spindle speed of 4000 r.p.m. Between these two was a wide variety of model types and sizes, some intended for just external grinding while others could grind both externally and internally - with up to twelve interchangeable spindle for the latter task and spindle speeds of up to 42,500 r.p.m..
Some Dumore products were also made under licence in England by  Kelston Engineering in Fishponds, Bristol--one of the models being the Mk.2 Versa-Mil. Should you have a product of this company, the writer would be keen to hear from you.
The pages below show many Dumore products of the 1950s, probably the decade when the range of models, and the many accessories offered, was at its widest..