1931
General Time Instruments Corporation (which had been fashioned in 1930 as a holding company for Western Clock Company and Seth Thomas) purchases the Hamilton-Sangamo Corporation.
Quoting from "Illinois Horology" by Andrew Hayes Miller and Dalia Maria Miller, p. 51, relating to the Sangamo electrical company:
"To meet the synchronous clock competition, they developed a non self beginning synchronous motor throughout the spring of 1930. In August, a replacement line of clocks was prepared for market. consistent with Robert C. Lanphier in Forty Years of Sangamo:
However, we have a tendency to soon realized that we would have liked a self-starting synchronous clock, therefore later that year created the primary sort "F" self-starting motor. . .We were close to supply a line of self beginning clocks. . . . when, in December 1930, the overall Time Instruments Corporation . . . owning the Western Clock company ("Big Ben") and Seth Thomas Clock Company expressed an interest in using the kind "F" motor in their electrical clocks. As we have a tendency to couldn't sell motors to the other concern than Hamilton-Sangamo, the upshot of the matter was that Mr. Ralph Matthiessen, President of G.T.I. corporation, offered to shop for the Hamilton-Sangamo Corporation, and therefore get the exclusive rights to use all of our motors, A.C. and D.C., for clock functions, still because the established business of the Hamilton-Sangamo Corporation. The business was so sold to G.T.I. Corporation in April, 1931, and Hamilton and Sangamo retired from the clock business, with considerable loss, however with a lot of valuable expertise.