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2. Bicycle drivetrain systems - Wikipedia

   en.wikipedia.org/wiki/Bicycle_drivetrain_systems

   A chain drive and rear derailleur gear change, the most popular system in use today A shaft-drive with crankset and rear gear hub. Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels.

3. Roller chain - Wikipedia

   en.wikipedia.org/wiki/Roller_chain

   Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.

4. Nathaniel Hayward - Wikipedia

   en.wikipedia.org/wiki/Nathaniel_Hayward

   Nathaniel Manley Hayward (January 19, 1808 – July 18, 1865) [1] was an American businessman and inventor best known for selling a patent to Charles Goodyear that Goodyear later used to develop the process of vulcanization.

5. Hayward, California - Wikipedia

   en.wikipedia.org/wiki/Hayward,_California

   Hayward Public Art Program mural detail (Jean Bidwell, artist) Hayward has been a Tree City USA since 1986. [106] Hayward declared itself a nuclear-free zone, a largely symbolic act, in 1987. [107] The city is the setting for the Hayward Gay Prom, one of the earliest and longest-running gay proms in the United States. The city introduced road ...

6. Hayward Fault Zone - Wikipedia

   en.wikipedia.org/wiki/Hayward_Fault_Zone

   The Hayward Fault is parallel to the San Andreas Fault, which lies offshore and through the San Francisco Peninsula. To the east of the Hayward Fault lies the Calaveras Fault. In 2007, the Hayward Fault was discovered to have merged with the Calaveras Fault east of San Jose at a depth of 6.4 kilometers (4.0 mi), with the potential of creating ...