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| US4492403 | 1 Jul 1982 | 8 Ene 1985 | | Method and apparatus for securing a wheelchair to a vehicle floor | | US4875813 | 6 Dic 1988 | 24 Oct 1989 | | Wheel chock | | US4993898 | 14 Dic 1988 | 19 Feb 1991 | Babcock Industries Inc. | Apparatus and system for tying down cargo |
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