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| 2 | William Vandersteel, U.S. Patent No. 4,458,602, 1980 |
| 3 | http://et3.com/index.html |
| 4 | http://faculty.washington.edu/-jbs/itrans/flextaxi.htm |
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| 6 | http://www.tubexpress.com/index.htm |
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| 8 | http://www.cargocap.de/html_en/strasse_01.html |
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