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4715243 | Morishita et al. | Dec 1987 | |
4886831 | Lanzerath et al. | Dec 1989 | |
5203223 | Himmeroeder | Apr 1993 |
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816052 | Jul 1937 | FRX |
Entry |
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Patent Abstracts of Japan, vol. 012, No. 343 (M-741), Sep. 14, 1988. |
Patent Abstracts of Japan, vol. 012, No. 454 (M-769), Nov. 29, 1988. |
Patent Abstracts of Japan, vol. 012, No. 208 (M-709), Jun. 15, 1988. |
Patent Abstracts of Japan, vol. 009, No. 249 (M-419), Oct. 5, 1985. |