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2. Shaft collar - Wikipedia

   en.wikipedia.org/wiki/Shaft_collar

   Shaft collars saw few improvements until 1910 through 1911, when William G. Allen and Howard T. Hallowell, Sr, working independently, introduced commercially viable hex socket head set screws, and Hallowell patented a shaft collar with this safety-style set screw. His safety set collar was soon copied by others and became an industry standard.

3. Shaft sinking - Wikipedia

   en.wikipedia.org/wiki/Shaft_sinking

   Shaft sinking. A plan-view schematic of a mine shaft showing cage and skip compartments. Services may be housed in either of the four open compartments. Shaft mining or shaft sinking is the action of excavating a mine shaft from the top down, where there is initially no access to the bottom. [1] Shallow shafts, typically sunk for civil ...

4. Bell 204/205 - Wikipedia

   en.wikipedia.org/wiki/Bell_204/205

   The Bell 204 and 205 are the civilian versions of the UH-1 Iroquois single-engine military helicopter of the Huey family of helicopters. They are type-certificated in the transport category and are used in a wide variety of applications, including crop dusting , cargo lifting, Forestry Operations, and aerial firefighting .

5. AOL Mail

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   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

6. Macchi C.205 Veltro - Wikipedia

   en.wikipedia.org/wiki/Macchi_C.205_Veltro

   The Macchi C.205 Veltro (Italian: Greyhound) (also known as MC.205, "MC" standing for "Macchi Castoldi") was an Italian World War II fighter aircraft built by the Aeronautica Macchi. Along with the Reggiane Re.2005 and Fiat G.55 , the Macchi C.205 was one of the three " Serie 5" Italian fighters built around the powerful Daimler-Benz DB 605 engine.

7. Boeing CH-47 Chinook - Wikipedia

   en.wikipedia.org/wiki/Boeing_CH-47_Chinook

   The Boeing CH-47 Chinook is a tandem-rotor helicopter originally developed by American rotorcraft company Vertol and now manufactured by Boeing Defense, Space & Security.The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters.