Number | Name | Date | Kind |
---|---|---|---|
D. 402645 | Garguilo | Dec 1998 | |
5745714 | Glass et al. | Apr 1998 | |
6031532 | Gourdol et al. | Feb 2000 |
Entry |
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The Icon Book, William Horton, John Wiley & Sons, Inc., unlock icon, p. 394, 1994.* |
Symbol Sourcebook, Henry Dreyfuss, Van Nostrand Reinhold, lock/unlock symbols, p. 35, curve/cam symbol, p. 108, dentist symbol, p. 118, 1994. |