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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]
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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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 ...
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.
[3] The -5 model was certified in 1982, and a decade later, an engine utilizing the TFE731-5 power section and a TFE731-3 fan was built and designated the TFE731-4, intended to power the Cessna Citation VII aircraft. [4] The most recent version is the TFE731-50, based on the -60 used on the Falcon 900DX, which underwent its flight test program ...
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