Robotic Technology Inc. EATR robots roam a barren landscape as an unmanned drone flies overhead in an artist's rendering. EATR robots roam a barren landscape as an unmanned drone flies overhead in an artist's rendering. It could be a combination of 19th-century mechanics, 21st-century technology — and a 20th-century horror movie. A Maryland company under contract to the Pentagon is working on a steam-powered robot that would fuel itself by gobbling up whatever organic material it can find — grass, wood, old furniture, even dead bodies.