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2. Belt (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Belt_(mechanical)

   An automotive belt with the number "740K6" or "6K740" indicates a belt 74 inches (190 cm) in length, 6 ribs wide, with a rib pitch of 9 ⁄ 64 of an inch (3.6 mm) (a standard thickness for a K series automotive belt would be 4.5mm). A metric equivalent would be usually indicated by "6PK1880" whereby 6 refers to the number of ribs, PK refers to ...

3. Belt problem - Wikipedia

   en.wikipedia.org/wiki/Belt_problem

   The belt problem. The belt problem is a mathematics problem which requires finding the length of a crossed belt that connects two circular pulleys with radius r 1 and r 2 whose centers are separated by a distance P. The solution of the belt problem requires trigonometry and the concepts of the bitangent line, the vertical angle, and congruent ...

4. Alvin Straight - Wikipedia

   en.wikipedia.org/wiki/Alvin_Straight

   Alvin Boone Straight (October 17, 1920 – November 9, 1996) was an American man who travelled 240 miles (390 km) on a riding lawn mower from Laurens, Iowa to Blue River, Wisconsin to visit his ailing brother in 1994.