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[3] The first portable power router was patented in 1906 by George Kelley and marketed by the Kelley Electric Machine Company. [4] The early electric routers were quite heavy, [5] and only nominally "portable". In 1915 Oscar and Rudy Onsrud produced an air-powered router, which they referred to as a Jet Motor Hand Router. [6]
Planes, router tables, measuring tools, sharpening equipment Lie-Nielsen Toolworks: ... Hand-held power tools, dust extraction tools, workplace organization
A computer numerical control (CNC) router is a computer-controlled cutting machine which typically mounts a hand-held router as a spindle which is used for cutting various materials, such as wood, composites, metals, plastics, glass, and foams.
This was a big safety concern as people's hand were very accessible to the cutter. In 1976, C.R. Onsrud patented [2] the Inverted Pin Router [3] that reversed the two and mounted the motor under the table and the guide pin on the "over arm". A template (with an interior recess on the top face removed) is affixed to the workpiece, and the guide ...
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The first German jet engines built during the Second World War used a mechanical APU starting system designed by the German engineer Norbert Riedel.It consisted of a 10 horsepower (7.5 kW) two-stroke flat engine, which for the Junkers Jumo 004 design was hidden in the intake diverter, essentially functioning as a pioneering example of an auxiliary power unit for starting a jet engine.
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