Standard Steel Propeller had been formed in 1918 in Pittsburgh, Pennsylvania, and Hamilton Aero Manufacturing had been formed in 1920 in Milwaukee, Wisconsin, by Thomas F. Hamilton. Charles Lindbergh's Spirit of St. Louis used a propeller made by Standard Steel Propeller Company in his historic solo crossing of the Atlantic Ocean. The two companies were merged in 1929 by the United Aircraft and Transport Corporation.[2]

In the early 1930s, Frank W. Caldwell of Hamilton Standard led a team that developed a variable-pitch propeller, using hydraulic pressure and centrifugal force to change the angle of attack of the blades. Caldwell received the 1933 Collier Trophy for this advance in flight propulsion. Later advances included full-feathering and reversible propellers.

Hamilton Standard was a division of United Aircraft Corporation (1934) along with Pratt & Whitney (engines).

In the early 1950s Hamilton developed the technology to accurately meter fuel in jet engines, and its fuel controls were employed on Boeing 707s and Douglas DC-8s, as well as most other Pratt & Whitney jet engines. In 1952, Hamilton Standard opened its plant in Windsor Locks, Connecticut. In 1958, Hamilton's first environmental control system entered service on the Convair 880. In 1968, Hamilton began delivering automatic, electronic systems for control of cabin pressure in aircraft. Hamilton's mechanical fuel controls, in use since the 1950s, evolved into electronically controlled fuel controls, and eventually, to full-authority digital electronic controls (FADEC) for jet engines, which are in use today on many commuter, airline, and military engine applications. Hamilton's environmental systems and early association with NASA were highlighted in the 1969 Apollo 11 moon landing - supported by environmental control, fuel cell, and life support systems manufactured by Hamilton Standard." (WIKI)