The key has double meaning for keylever and for typebar in Sholes' patent number: 118491.
http://qwerty-history.g.hatena.ne.jp/raycy/20110127/1296090951
http://www.google.com/patents/about?id=SVJpAAAAEBAJ&dq
S represents a series of keys, pivoted on a fulcrum below the ratchets J K, to reach under and work the types. T represents a slotted disk, fastened above the rear ends of the keys and directly under the main axle B. U represents a series of keys, pivoted in the slots of the disk T so as to strike at a point in the center thereof, directly under the main axle B.
http://www.google.com/patents?id=SVJpAAAAEBAJ&printsec=abstract&zoom=4#v=snippet&q=pivoted%20in%20the%20slots%20of%20the%20disk%20T%20so%20as%20to%20strike%20at%20a%20point%20in%20the%20center&f=false
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