Ventilated Hat Small 256×320 Medium 512×640 Large 819×1024 Download Tiff Original 1920×2400 | (359.9 KB) Description Hat featuring top central fan for ventilation. Keywords fan, hat, ventilation Galleries Hats and Headdresses Source: House of Representatives Report of the Commissioner of Patents for the Year 1860 (Washington, DC: George W. Bowman, 1861)
