This company built French Le-Rhone engines under license (US&S).

From Appendix A2/6: The main text states that this brand manufactured rotary engines under French license. Specifically, the Le Rhone Model C of World War I.

The Model C was an air-cooled 9-cylinder engine, giving 80 HP at 1200 rpm, and a total displacement of almost 11 liters.

In the photo of this engine, owned by the Smithsonian Museum in Washington, we see it with a 4-blade propeller.

“Union-Le Rhone 9C” (somewhat mutilated)

From Appendix 12: During World War I (WWI) and in 1915, this railway signaling brand produced war material such as cannons, heavy weapons, and light weapons (Colt pistols, for example).

It is also known that they produced the French Le Rhone 9-C radial rotary engine (sometimes referred to as the C.9), with 80-110 hp and 9 cylinders.

“US&S C.9, licensed by Le-Rhone”