This is a divisional of application Ser. No. 656,661, filed 10/1/84, which, in turn, is a divisional of application for U.S. Letters Patent, Ser. No. 511,965, filed on 7/8/83, now U.S. Pat. No. 4,491,537 issued 1/1/85.
| Number | Name | Date | Kind |
|---|---|---|---|
| 3632396 | Perre-Zamora | Jan 1972 | |
| 3919324 | Himmele et al. | Nov 1975 | |
| 4113781 | Aquilae et al. | Sep 1978 | |
| 4242281 | Sprecker et al. | Dec 1980 | |
| 4271048 | Buchi et al. | Jun 1981 | |
| 4281177 | Sprecher et al. | Jul 1981 | |
| 4435585 | Gramer et al. | Mar 1984 | |
| 4491537 | Fujioka et al. | Jan 1985 |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 656661 | Oct 1984 | |
| Parent | 511965 | Jul 1983 |