1950 – Radio-controlled Lawnmower – Jim Walker (American)

Source: Popular Science, Mar 1950 Mows Lawn by Radio—Pretty Soft!    WHILE his robot lawn mower chugs around the lawn, Jim Walker, of Portland, Ore., takes it easy in his glider, sipping a cool drink and operating the radio controls.   Walker, a radio ham, long-time builder of radio-controlled model planes, and president of a …

1938 – Remote-Controlled Lawn Mower – Alvin Lodge (American)

Source: Mechanix Illustrated, Oct, 1938 (from blog.modernmechanix.com ) Builds Remote Control Lawn Mower Device Attaching two electric – motors, an old paint can, a wooden mixing bowl from a kitchen, sundry gears, wires and drive belts to a regulation lawn mower, Alvin Lodge, an unemployed mechanical engineer of Millersville, Pa., constructed a device that enables him …