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 …
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