For complete listing information please select the Click To Bid button to see this item on eBay. thepatentguy Store Museum Quality Reproduction of the US PATENT for the MINING DRILL BIT!!! This Tricone Drill bit was patented by Howard Hughes Sr in 1909 and created the Hughes fortune that allowed his son, of the same name, to become the eccentric figure that he became. Each sheet of this patent is reproduced on 8.5" by 11" Antiqued Parchment Paper, and includes the Drawing Sheet and Description sheet shown.Own an amazing piece of HISTORY!!! Ready to FRAME!!!Buy it Now!!! This is a low resolution scan of the actual documents for fast loading. The actual documents are of museum sharpness and quality.