This company is the most important factory of propellers and "governors" (speed controller) in North America. It is a Division of "United Technologies Corp." in Connecticutt, and builds auxiliary turbine engines like the ST6L-73 with 720 hp power output and 386 lbs/min of air conditioning output for cabin. It is installed, for example, on the Tristar L-1011. (See Hamilton Sundstrand)

“ST6L”

From Appendix 6: The rocket-engine construction by this brand is generally unknown. As it is focused on propellers and auxiliary groups.

“Thruster for the Centaur Shuttle”

-The rocket engine shown in the picture above was a development from other rocket engines, installed on the Atlas and Titan, and was intended for the canceled Centaur Shuttle project.