For sharpening skate blades, i.e. blades having two sharp edges defined by

Official title: {for sharpening skate blades, i.e. blades having two sharp edges defined by three surfaces intersecting in pairs at an angle of substantially 90°}

B24D15/066 (For sharpening skate blades, i.e. blades having two sharp edges defined by) appears on 45 US grants and 28 published applications in this corpus.