US2439279A - Saw-tooth sharpener - Google Patents
US2439279A US646776A US64677646A US2439279A US 2439279 A US2439279 A US 2439279A US 646776 A US646776 A US 646776A US 64677646 A US64677646 A US 64677646A US 2439279 A US2439279 A US 2439279A Authority US United States Prior art keywords saw tooth frame grinding relative Prior art date Legal status (The legal status is an assumption and is not a legal …