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Number | Name | Date | Kind |
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2269169 | Derhoef et al. | Jan 1942 | |
2620285 | Rose | Dec 1952 | |
3650749 | Willems et al. | Mar 1972 | |
3666457 | Youngquist | May 1972 |
Number | Date | Country |
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2412098 | Jul 1979 | FRX |
Entry |
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Patent Abstracts of Japan, vol. 9, No. 199 (P-380)(1922), Aug. 16, 1985, Abstract of Japanese JP-A-6063535. |
Patent Abstracts of Japan, vol. 14, No. 5 (P-97)(883) Jan. 13, 1982, Abstract of Japanese JP-A-56132,334. |