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2. Poulan - Wikipedia

   en.wikipedia.org/wiki/Poulan

   The Poulan brand name is used primarily for outdoor power equipment, such as chainsaws, lawn mowers, and leaf blowers, aimed at the mid-level consumer market.Since Poulan is owned by Husqvarna, the two brands often share technologies.

3. Back belt - Wikipedia

   en.wikipedia.org/wiki/Back_belt

   Back belts are popular among workers across a number of industries—airline baggage handlers, warehouse workers, piano movers, grocery clerks, etc.—specifically to prevent lifting injuries. [2] The theory underlying the use of back belts is that the belts reduce forces on the spine, stiffen the spine, or increase intra-abdominal pressure. [1]

4. 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 ...