This is a divisional of application, Ser. No. 872,937 filed on Jan. 27, 1978, now U.S. Pat. No. 4,131,687 issued on Dec. 26, 1978.
Number | Name | Date | Kind |
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2248518 | Stanley et al. | Jul 1941 | |
2388765 | Rummelsburg | Nov 1945 | |
2467330 | Milas | Apr 1949 | |
3840604 | Chodnekar et al. | Oct 1974 |
Number | Date | Country |
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559076 | Jun 1958 | CAX |
Entry |
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Debrauwere et al., Chem. Abs., vol. 83 (1975) 25073c. |
Burczyk, Chem. Abs., vol. 74 (1971) 13285z. |
Number | Date | Country | |
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Parent | 872937 | Jan 1978 |