USNR (US Natural Resources Co.) claims to date back to the 1850s although that is likely the earliest founding date of one of the many manufacturers they have acquired. USNR was originally a vendor of sawmill and wood processing machinery and systems, but since the 1980s has acquired the product lines of a long list of sawmill machinery manufacturers, including Forano Ltd., Irvington Machine Works, Letson & Burpee, Ltd., and Schurman Machine Works.