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Westinghouse Air Brake Technologies Links of London Charms filed the patent application April 1, 2005. The patent application number is 847/DEL/2005 A. The International classification number is B61D1/00. According to the Controller General of Patents, Designs & Trade Marks, "The present invention concerns a rail vehicle having a car body and at least one wheel truck, the wheel truck having a bolster rotatably mounted to the car body, a plurality of wheels which engage a railed track such that the bolster rotates as the rail vehicle makes a turn, Links of London I Charm a brake shoe for frictionally engaging at least one of said plurality of wheels, a parking brake comprising an application rod having a first end operably connected to the brake shoe and a second operably connected to a first portion of an application lever; a first pneumatic valve connected to a second portion of the application lever, such that operation of the pneumatic valve engages the brake shoe to said at least one car wheel; and means for compensating a position of the Links of London K Charm lever as the bolster rotates." Westinghouse Air Brake Technologies Corporation (Wabtec) (Public, NYSE:WAB), doing business as Wabtec Corporation, is a provider of technology-based equipment and services for the global rail industry. The Company provides its products and services through two segments: the Freight Group and the Transit Group. On October 1, 2009, the Company acquired Unifin International LP, and its affiliate, Cardinal Links of London M Charm and Exchangers, Inc. (Unifin). In March 2010, the Company acquired Xorail LLC, a provider of signal engineering and design services.