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| US4001956 | 17 Sep 1975 | 11 Ene 1977 | Caterpillar Tractor Co. | Tractor scraper transportation and assembly therefor |
| US4142309 | 17 Feb 1978 | 6 Mar 1979 | Caterpillar Tractor Co. | Scraper bowl-lift apparatus |
| US4328630 | 13 Nov 1980 | 11 May 1982 | General Motors Corporation | Pullyoke assembly for a scraper |
