| Number | Name | Date | Kind |
|---|---|---|---|
| 1830 | Petrimoulx et al. | Jan 1840 | |
| 5335169 | Chong | Aug 1994 | |
| 5943657 | Freestone et al. | Aug 1999 | |
| 6148291 | Radican | Nov 2000 |
| Number | Date | Country |
|---|---|---|
| 4-98494-A | Mar 1992 | JP |
| Entry |
|---|
| Dun's Business Month “Trucks, taxes, and tribulation (taxation of truck fleets)”, article (v123, p124), dated Oct. 1983. |