Number | Name | Date | Kind |
---|---|---|---|
1360617 | Brand | Nov 1920 | |
3931644 | Ward | Jan 1976 | |
3940794 | Griffiths et al. | Feb 1976 |
Entry |
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IBM Technical Disclosure Bulletin, vol. 18, No. 12, May 1976, pp. 4112-4114. |
IBM Technical Disclosure Bulletin, vol. 19, No. 1, Jun. 1976, p. 171. |