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| Number | Title | Issue Date |
| 4883402 | Coupling system for drop box The coupling of the present invention is comprised of a carriage which moves along a track mounted in a support frame by means of a motor driven endless chain. The chain is connected to a pivot plate, which is rotatably attached to the carriage. The chain... | 11/28/1989 |
| 4764080 | Coupling for drop box system The coupling of the present invention is comprised of a carriage which moves along a track mounted in a support frame by means of a motor driven endless chain. The chain is connected to a pivot plate, which is rotatably attached to the carriage. The chain... | 08/16/1988 |
