Number | Date | Country | Kind |
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198 38 332 | Aug 1998 | DE |
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3058840 | Kerr et al. | Oct 1962 | |
3307968 | Schnedler | Mar 1967 | |
5785772 | Deka | Jul 1998 |
Entry |
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Patent Abstracts of Japan, vol. 017, No. 382 (C-1085), Jul. 19, 1993 & JP 05 065614 A (Nippon Steel Corp) Mar. 19, 1993. |
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