Number | Name | Date | Kind |
---|---|---|---|
4020830 | Johnson et al. | May 1977 | |
4180771 | Guckel | Dec 1979 | |
4218298 | Shimada et al. | Aug 1980 | |
4238757 | Schenck | Dec 1980 |
Number | Date | Country |
---|---|---|
52-24085 | Feb 1977 | JPX |
Entry |
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Barthold, IBM Tech. Discl. Bulletin, vol. 19, No. 4, Sep. 1976, p. 1292. |