Keywords: Freeman Furnace System.jpg Patent drawing of Freeman furnace system involved in The Mercoid Cases<br/> ;Other information Patent drawing US Patent No 1813732 1930 US Gov't PD-USGov Original upload log en wikipedia Freeman+Furnace+System jpg wikitable - 2016-03-15 01 13 800×579× 72905 bytes PraeceptorIP Uploading a public-domain item using File Upload Wizard Uncategorized 2016 April 3 |