This application is a division of application Ser. No. 879,788, filed Feb. 21, 1978, now U.S. Pat. No. 4,164,510, which in turn is a continuation-in-part of copending application, Ser. No. 818,233 filed July 22, 1977, now abandoned.
Number | Name | Date | Kind |
---|---|---|---|
2773906 | Emerson | Dec 1956 | |
2862973 | Winkler et al. | Dec 1958 | |
2954405 | Hock et al. | Sep 1960 | |
3028410 | Zimmer | Apr 1962 | |
3402205 | Gregory | Sep 1968 | |
3634328 | Brownstein | Jan 1972 | |
3666815 | Scheltus | May 1972 |
Number | Date | Country | |
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Parent | 879788 | Feb 1978 |
Number | Date | Country | |
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Parent | 818233 | Jul 1977 |