Bizarre Patents
A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 3961447 | Prison door locking mechanism A prison door locking mechanism particularly suitable for use with each of a pair of sliding prison doors laterally movable into stacking or overlapping position. The door locking mechanism includes a novel pivotally mounted locking dog having a latch eng... | 06/08/1976 |
