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Oil Drilling Rig Patent , Howard Hughes Poster, Oil Drilling Rig Patent by Howard Hughes, Oil Rig Patent by STANLEYprintHOUSE 0.79 USD This is a vintage patent print. The Oil Drilling Rig Patent by Howard Hughes from 1916. This poster is printed using high quality archival inks, and will be of museum quality. Any of these posters will make a great affordable gift, or tie any room together. Please choose between di .. https://www.etsy.com/ca/listing/229566491/oil-drilling-rig-p..