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2. Scissor grinder - Wikipedia

   en.wikipedia.org/wiki/Scissor_grinder

   Knife and scissor grinder sharpening a knife on a water-cooled grinding wheel, 2018. A scissor grinder (German: Scherenschleifer ), sometimes also scissor and knife grinder or knife and scissor grinder , for short also knife grinder, is a craftsman who sharpens and repairs blunt knives, scissors and other cutting tools.

3. Knife sharpening - Wikipedia

   en.wikipedia.org/wiki/Knife_sharpening

   Knife sharpening is the process of making a knife or similar tool sharp by grinding against a hard, rough surface, typically a stone, [1] or a flexible surface with hard particles, such as sandpaper. Additionally, a leather razor strop , or strop, is often used to straighten and polish an edge.

4. Sharpness (cutting) - Wikipedia

   en.wikipedia.org/wiki/Sharpness_(cutting)

   Sharpness is also a critical attribute for man-made tools ranging from kitchen knives and scissors to industrial cutting equipment, as it allows the user of a sharp implement to efficiently penetrate surfaces, or neatly divide other materials into smaller portions as needed. A balance must be found between the sharpness and how well it can last.

5. 50 Companies with Lifetime Warranties: If It Breaks, They’ll ...

   www.aol.com/39-companies-offer-lifetime-warranty...

   Knife-maker Cutco was founded in Olean, New York, in 1949. It offers a “forever guarantee” that extends to knives given as gifts or hand-me-downs. The guarantee includes free sharpening to ...

6. Sharpening - Wikipedia

   en.wikipedia.org/wiki/Sharpening

   Video: Saw blade sharpening machine Edge/Apex of a knife after sharpening and stropping. Although this edge is sharp enough to bite a thumbnail, cut paper smoothly, or shave arm hair, the microscope plainly shows an edge which reflects light back into the lens.

7. Cutlery and Allied Trades Research Association - Wikipedia

   en.wikipedia.org/wiki/Cutlery_and_Allied_Trades...

   CATRA was originally set up by the British Government in 1952 to carry out developments for the UK's cutlery and knife industries, for which the area of Sheffield in Yorkshire is world-famous. CATRA has developed a range of unique machines for measuring the cutting performance of all types of cutting edges from razor blades to large knives used ...