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 …