Cincinnati Milling Machine Co. that was founded in Cincinnati, Ohio in America in 1884 was the forerunner of CINCINNATI Co. The name of CINCINNATI Co. was changed to Cincinnati Milacron Inc., the present name, in 1970 (1).
IKEGAI purchased a CINCINNATI 2nd universal milling machine to machine-cut gears as it was the leading company in this field (2).

Reference:
(1)
(2)