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3753911 | Walker, Jr. et al. | Aug 1973 | |
4626369 | Walker, Jr. | Dec 1986 | |
4710479 | Yamanaka et al. | Dec 1987 | |
4883777 | Yamanaka | Nov 1989 |
Number | Date | Country |
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25 48 736 | May 1978 | DE |
37 12 569 C2 | Oct 1991 | DE |
4-160035 | Jun 1992 | JP |
Entry |
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