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2. craigslist - Wikipedia

   en.wikipedia.org/wiki/Craigslist

   Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...

3. Ultrasonic/sonic driller/corer - Wikipedia

   en.wikipedia.org/wiki/Ultrasonic/sonic_driller/corer

   The free mass vibrates between the drill stem and the horn of the actuator to transmit the vibrations down the drill stem. The drill stem houses the drill bit, and the vibrations push the bit into the material. The repetitive impact on the drill stem by the free mass, creates stress pulses that transmit to the tip of the bit and into the rock.

4. Core drill - Wikipedia

   en.wikipedia.org/wiki/Core_drill

   Truck-mounted core drill. A modern core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core. Core drills used in metal are called annular cutters. Core drills used for concrete and hard rock generally use industrial diamond grit as the ...

5. Annular cutter - Wikipedia

   en.wikipedia.org/wiki/Annular_cutter

   An annular cutter (also called a core drill, core cutter, broach cutter, trepanning drill, hole saw, or cup-type cutter) is a form of core drill used to create holes in metal. An annular cutter, named after the annulus shape , cuts only a groove at the periphery of the hole and leaves a solid core or slug at the center.

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7. Musk creates new power base in Washington with takeover of US ...

   www.aol.com/news/musk-creates-power-washington...

   Elon Musk's rapid takeover of two U.S. government agencies has enabled the South African-born billionaire to exert unprecedented control over America's 2.2-million-member federal workforce and ...