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A method for inducing cats to exercise consists of directing a beam of invisible light produced by a hand-held laser apparatus onto the floor or wall.
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| Number | Title | Issue Date |
| 4783091 | Apparatus for exercise and recreation An apparatus called the "disco-car" is used for both exercise and recreation and comprises an exercising board, a direction-control mechanism and a wheel system. The disco-car does not need any driving power and can start to run at the player's will so lo... | 11/08/1988 |
