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2. Four-bar linkage - Wikipedia

   en.wikipedia.org/wiki/Four-bar_linkage

   Planar quadrilateral linkage, RRRR or 4R linkages have four rotating joints. One link of the chain is usually fixed, and is called the ground link, fixed link, or the frame. The two links connected to the frame are called the grounded links and are generally the input and output links of the system, sometimes called the input link and output link.

3. Linkage (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Linkage_(mechanical)

   Linkages may be constructed from open chains, closed chains, or a combination of open and closed chains. Each link in a chain is connected by a joint to one or more other links. Thus, a kinematic chain can be modeled as a graph in which the links are paths and the joints are vertices, which is called a linkage graph.

4. Collett E. Woolman - Wikipedia

   en.wikipedia.org/wiki/Collett_E._Woolman

   After leaving the cockpit and going back to tell his wife, he got off and stood by the gate (chain link fence actually). After starting those big old Wright 3350's I leaned forward and looked out of the Captain's window to see Mr. C. E. Woolman, Principal Founder and President of Delta Air Lines, standing there waving goodbye to us.

5. Slider-crank linkage - Wikipedia

   en.wikipedia.org/wiki/Slider-crank_linkage

   Slider-crank chain inversion arises when the connecting rod, or coupler, of a slider-crank linkage becomes the ground link, so the slider is connected directly to the crank. This inverted slider-crank is the form of a slider-crank linkage that is often used to actuate a hinged joint in construction equipment like a crane or backhoe, as well as ...

6. Frank J. Mafera - Wikipedia

   en.wikipedia.org/wiki/Frank_J._Mafera

   Mafera's brother already owned a chain-link fence company in Medford, Massachusetts, [2] and Mafera's 1931 patent was one of the several advancements made by the Maferas in the development of chain-link fencing. Mafera first sold the fencing from his house in Raymond, New Hampshire, under the name of the Barnyard Fence Company.

7. Master link - Wikipedia

   en.wikipedia.org/wiki/Master_link

   A master link or quick-release link is a roller chain accessory that allows convenient connection and disconnection of a chain without the need for a chain tool. [1] It acts as a set of the chain's outer plates, so joining two sets of the chain's inner plate ends. Such master links may or may not be re-usable. [2]