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Tarski's circle-squaring problem is the challenge, posed by Alfred Tarski in 1925, [1] to take a disc in the plane, cut it into finitely many pieces, and reassemble the pieces so as to get a square of equal area. It is possible, using pieces that are Borel sets, but not with pieces cut by Jordan curves.
Variations include horizontal boring and disc sander. The original Shopsmith 10E and 10ER were invented by Dr. Hans Goldschmidt [1] of Albany, CA, in 1947; made by the Magna America Corporation in Berkeley, CA, from 1947 to 1953; and sold by Montgomery Ward. [2] The Mark 5 [3] debuted in 1953 but went out of production in 1964.
The first pneumatic straight line sander was patented by Otto Hendrickson in 1969. [2] Stroke sander: A large production sander that uses a hand-operated platen on a standard sanding belt to apply pressure. For large surfaces such as tabletops, doors, and cabinets. Tabletop drum sander: A bench-top sander that uses a rotating drum.
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Angle grinder. An angle grinder, also known as a side grinder or disc grinder, is a handheld power tool used for grinding (abrasive cutting) and polishing.Although developed originally as tools for rigid abrasive discs, the availability of an interchangeable power source has encouraged their use with a wide variety of cutters and attachments.
A bench grinder is a benchtop type of grinding machine used to drive abrasive wheels. A pedestal grinder is a similar or larger version of grinder that is mounted on a pedestal, which may be bolted to the floor or may sit on rubber feet. These types of grinders are commonly used to hand grind various cutting tools and perform other rough ...