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  2. Hole saw - Wikipedia

    en.wikipedia.org/wiki/Hole_saw

    Tungsten carbide hole saw with arbor A 52 mm (2.0 in) hole saw with pilot bit A 115 mm (4.5 in) diamond hole saw. A hole saw (also styled holesaw), also known as a hole cutter, [1] is a saw blade of annular (ring) shape, whose annular kerf creates a hole in the workpiece without having to cut up the core material.

  3. Economic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_the...

    Woodworking machinery such as circular saws, high speed lathes, planers and mortising machines and various other machines amazed British visitors, as was reported by Joseph Whitworth. [112] See: American system of manufacturing#Use of machinery. In the early 19th century machinery was made mostly of wood with iron parts.

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