Number | Date | Country | Kind |
---|---|---|---|
1919/78 | Feb 1978 | CHX | |
13256/78 | Dec 1978 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
3457180 | Kretz et al. | Jul 1969 | |
3600445 | Wirth et al. | Aug 1971 |
Entry |
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Gaugh et al., Research Disclosure No. 135, pp. 31-35, Pub. by Industrial Opportunities Ltd., Homewell, England, 7/75. |