Browne and Sharpe, Providence, Rhode Island, once manufactured a variety of machines, as already mentioned. They even promoted their own taper for milling cutters, which became rather widely used, considering its proprietary nature.
My father bought a used B&S Model 0 Horizontal Milling Machine about 1946, which he used in construction of three 1″ scale locomotives. It was quite accurate and a very heavy and RUGGED floor-mounted machine, at its best hogging-out large chunks of cast iron into cylinders, or milling two 1/2″ thick steel bar frames at once. On the other hand, it was sensitive enough for small work; I machined a pair of bronze cylinder castings on it for my 2.5″ gauge locomotive.
B&S still produces precision measuring instruments, of which I have a few, in competition with their prime U.S. rival, Starrett. The B&S web page is at:
http://www.brownandsharpe.com/
Bob Thomas