Keywords: The Cross Furnace Control System.jpg This is a patent drawing from one of the patents involved in The Mercoid Cases US Patent1758146 1930 US Government PD-USGov Original upload log en wikipedia The+Cross+Furnace+Control+System jpg wikitable - 2016-03-15 01 03 800×858× 152838 bytes PraeceptorIP Uploading a public-domain item using File Upload Wizard Uncategorized 2016 May 6 |