Vintage B.F. McDonald Co. (Los Angeles) Aluminum Hard Hat w/ original liner

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Vintage B.F. McDonald Co. (Los Angeles) Aluminum Hard Hat w/ original liner. RARE find to have the original liner with an original BF McDonald Co. hard helmet. Each metal connector for the origional liner to connect to has the patent stamped on it. Patent that is stamped on lip of helmet is: US Patent NO. 2177145 / NO.D118432.