Number | Name | Date | Kind |
---|---|---|---|
4267600 | Campbell | May 1981 | |
5008953 | Dahlin et al. | Apr 1991 | |
5042082 | Dahlin | Aug 1991 | |
5073900 | Mallinckrodt | Dec 1991 | |
5193102 | Meidan et al. | Mar 1993 | |
5283780 | Schuchman et al. | Feb 1994 | |
5285469 | Vanderpool | Feb 1994 | |
5289272 | Rabowsky et al. | Feb 1994 | |
5291516 | Dixon et al. | Mar 1994 | |
5355161 | Bird et al. | Oct 1994 | |
5381443 | Borth et al. | Jan 1995 |
Entry |
---|
Dr. John L. Fike et al., Understanding Telephone Electronic, pp. 6-28 through 6-35; (Howard Sams, Indianapolis; 1983). |