Number | Name | Date | Kind |
---|---|---|---|
3588095 | Ward et al. | Jun 1971 | |
3794417 | Machmer | Feb 1974 | |
3874894 | Pedersen | Apr 1975 | |
4188109 | Idenawa et al. | Feb 1980 |
Number | Date | Country |
---|---|---|
52-4845 | Jan 1977 | JPX |
Entry |
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Xerox Disclosure Journal, vol. 4, No. 2, p. 215, 4-1979. |