Patent Grant
D389576
| Number | Name | Date | Kind |
|---|---|---|---|
| D230212 | Hart | Jan 1974 | |
| 370711 | Pratt | Sep 1887 | |
| 3152659 | Littmann | Oct 1964 | |
| 3182129 | Clark et al. | May 1965 | |
| 3247324 | Cefaly et al. | Apr 1966 | |
| 3346069 | Speelman | Oct 1967 | |
| 3455293 | Bethune | Jul 1969 | |
| 3665087 | Poylo | May 1972 | |
| 3989895 | O'Daniel, Sr. | Nov 1976 | |
| 4200169 | MacDonald, III et al. | Apr 1980 | |
| 4254302 | Walshe | Mar 1981 | |
| 4270627 | Hill | Jun 1981 | |
| 4440258 | Packard | Apr 1984 | |
| 4528689 | Katz | Jul 1985 | |
| 4528690 | Sedgwick | Jul 1985 | |
| 4534058 | Hower | Aug 1985 | |
| 4569413 | Allen | Feb 1986 | |
| 4770189 | Shyu | Sep 1988 | |
| 4783813 | Kempka | Nov 1988 | |
| 4878501 | Shue | Nov 1989 | |
| 4903794 | Klippert et al. | Feb 1990 | |
| 5010889 | Bredesen et al. | Apr 1991 | |
| 5025809 | Johnston et al. | Jun 1991 | |
| 5218969 | Bredesen et al. | Jun 1993 |
