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September 15, 2022

Electro Magnets Clear Tacks Off Universal City Streets, 1930

Electro magnets on a bar mounted on wheels and trailed after a car make the streets of Universal City, California, safe for motorists. The magnets pick up nails, tacks, pieces of wire, lost bolts and nuts and a wide variety of other metal objects which if left in the streets would cause punctures and other tire trouble. Frank Graves, electrical chief of the city, invented the puncture fighter.

Car with magnetic trailer makes streets safe.




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