Early Design Ventilator Small 320×141 Medium 640×282 Large 1024×451 Download Tiff Original 2400×1057 | (253.7 KB) Description A device such as a fan that introduces fresh air or expels foul air Keywords breathing apparatus, breathing device, breathing machine, device, ventilator Galleries Appliances Source: Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
