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| Number | Title | Issue Date |
| 3990719 | Tow bar and hitch assembly A tow bar and hitch assembly for coupling together industrial carts so they can be towed in train-like fashion. A hitch member is fixed to the bed of a towing cart and receives a tow bar rotatably and slidingly supported by the bed of a towed cart. When n... | 11/09/1976 |