参考文献:
Nuss, John M. Harrison, Stephen D. Ring, David B. Boyce, Rustum S. Johnson, Kirk Pfister, Keith B. Ramurthy, Savithri Seely, Lynn Wagman, Allan S. Desai, Manjo Levine, Barry H. Patent: US2002/15087 A1, 2002 US 2002015087 A1
参考文献:
Nuss, John M. Harrison, Stephen D. Ring, David B. Boyce, Rustum S. Johnson, Kirk Pfister, Keith B. Ramurthy, Savithri Seely, Lynn Wagman, Allan S. Desai, Manjo Levine, Barry H. Patent: US2002/15087 A1, 2002 US 2002015087 A1