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| Number | Title | Issue Date |
| 6370697 | Device and method of allowing air to circulate into and out of a hat A device for allowing air to circulate is disclosed. An embodiment of the device has a base having an arcuate first side and a second side. The second side has a rib extending from the second side. The device also has a means for attaching the base to a h... | 04/16/2002 |
