Around the 1930s, Mr. Gustav Rasmus of San Diego, California invented rocket-powered projectiles that were directed toward aircraft automatically guided by noise.

-An ingenious system for his time since later, much larger and further-reaching would appear the SAM (Surface-Air Missile).

"G. Rasmus and his ready little missile "

"They could be sown like a minefield" (PiP)

-Its engine clearly runs on solid fuel.