Number | Name | Date | Kind |
---|---|---|---|
D248769 | Jetter | Aug 1978 | |
1818653 | Steen | Aug 1931 | |
2832081 | Young | Apr 1958 | |
2910704 | Kinsey et al. | Nov 1959 | |
3150383 | Reich | Sep 1964 | |
3551921 | Fox et al. | Jan 1971 | |
4194252 | Tsuei | Mar 1980 | |
4669131 | Barlow | Jun 1987 | |
4763366 | Moreland | Aug 1988 |