Number | Name | Date | Kind |
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2441649 | Sprague | May 1948 | |
3474936 | McDonnell | Oct 1969 | |
4998674 | Torra | Mar 1991 | |
5271531 | Rohr et al. | Dec 1993 | |
5429282 | Stebick | Jul 1995 | |
5439143 | Brown et al. | Aug 1995 |
Entry |
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U.S. patent application Ser. No. 08/258,659, filed Jun. 10, 1994. |
U.S. patent application Ser. No. 08/565,821, filed Dec. 1, 1995. |