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| Number | Title | Issue Date |
| 5048153 | Spa cover lift mechanism A lift mechanism (15) for the cover (13) of a portable spa or hot tub (11) comprising a pair of compressible struts (21) and upper and lower hinge mechanisms (24 and 23) is disclosed. The preferred lower hinge mechanism (23) includes a torque tube (25) ro... | 09/17/1991 |