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By the late 1940's, advancing plastics technology permitted the molding of one-piece helmets without joints or seams. Referred to as "Shock-Proof" or "Safety Helmets," early 1-piece molded plastic helmets claimed to be pliable yet indestructible.
1952 MacGregor Goldsmith E604
c.1950 1-Piece Plastic Helmets
1950 Spalding 100FH