参考文献:
Dumas, Jacques Miller, Scott Osterhout, Martin Khire, Uday Lowinger, Timothy B. Riedl, Bernd Scott, William J. Smith, Roger A. Wood, Jill E. Gunn, David Rodriguez, Martha Wang, Ming Turner, Tiffany Brennan, Catherine Patent: US28/269265 A1, 28 Location in patent: Page/Page column 19 US 28269265 A1