Number | Date | Country | Kind |
---|---|---|---|
3131268 | Aug 1981 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
1968941 | Hall | Aug 1934 | |
2804304 | Taini | Aug 1957 | |
4269405 | Mitzel | May 1981 |
Entry |
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IBM Technical Disclosure Bulletin, vol. 14, No. 8, pp. 2414 and 2415, Jan. 1972, "Double Document Separator," J. H. Massey. |