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5-051502 | Feb 1993 | JPX |
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3921080 | Hardy | Nov 1975 | |
3970774 | Bazin et al. | Jul 1976 | |
4835482 | Tamakoshi et al. | May 1989 | |
4903226 | Tsividis | Feb 1990 |
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WO8900739 | Jan 1989 | WOX |
Entry |
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Patent Abstracts of Japan, vol. 4, No. 67 (E-100) 20 May 1980 & JP-A-55 034 593; English abstract. |
Patent Abstracts of Japan, vol. 13, No. 201 (E-757) 12 May 1989 & JP-A-01 020 788; English abstract. |
Derwent Abstract--Soviet Inventions Illustrated, Section EQ, Week 8548, 23 May 1985, AN 85-301827 & SU-A-1 157 677 (May 1985). |