Number | Name | Date | Kind |
---|---|---|---|
3012893 | Kremzner | Dec 1961 | |
3169888 | Ryan et al. | Feb 1965 | |
3741795 | Signorino | Jun 1973 | |
4127645 | Witzel | Nov 1978 | |
4159210 | Chen | Jun 1979 |
Entry |
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Little, et al., Tablet Making, Northern Pub. Co. Ltd., Liverpool, England, 1963 pp. 47-51. |