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In 1981, Pentair, Inc. acquired Rockwell's power tool group — consisting of Porter-Cable and Delta Machinery — and restored the Porter-Cable name. The company ended production of consumer level tools, and repositioned itself as a manufacturer of professional power tools. In 1989, it introduced the first electric random orbital sander.
A random orbit sander, with disks of various grit sizes. A random orbital sander (also known as a palm sander) is a hand-held power tool which sands in a random-orbit action. That is, in constant irregular overlapping circles. This technology was first commercially utilized in 1968 [citation needed] [1] by Rupes Tools.
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A random orbit sander, with disks of various grit sizes. A sander is a power tool used to smooth surfaces by abrasion with sandpaper.Sanders have a means to attach the sandpaper and a mechanism to move it rapidly contained within a housing with means to handhold it or fix it to a workbench.
Launch loop (not to scale). The red marked line is the moving loop itself, blue lines are stationary cables. A launch loop, or Lofstrom loop, is a proposed system for launching objects into orbit using a moving cable-like system situated inside a sheath attached to the Earth at two ends and suspended above the atmosphere in the middle.
In 1960, another Russian, Yuri Artsutanov, wrote in greater detail about the idea of a tensile cable to be deployed from a geosynchronous satellite, downwards towards the ground, and upwards away, keeping the cable balanced. [4] This is the space elevator idea, a type of synchronous tether that would rotate with the Earth. However, given the ...
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