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2979071 | Herring et al. | Apr 1961 | A |
4130128 | Kaneko | Dec 1978 | A |
D253365 | Nyberg | Nov 1979 | S |
4262691 | Kacal | Apr 1981 | A |
5417404 | Varden | May 1995 | A |
7278448 | Christenson et al. | Oct 2007 | B2 |
7409966 | Chang | Aug 2008 | B2 |