1928 Copper Bank Vault Ventilator Fan
1928 Copper Bank Vault Fan. Made by the O. McClintock CO of Sioux City, Iowa. April 17, 1928, WEST PAT. Patent filed by Ross R. The fan was intended to be used in ventilating the interior of a bank vault. The fan is 27 inches high. Small end is about 3 inches across. Large fan…
