| Number | Date | Country | Kind |
|---|---|---|---|
| 3701713 | Jan 1987 | DEX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2437425 | Goodhue et al. | Mar 1948 | |
| 2526847 | Brereton | Oct 1950 | |
| 2594198 | Motley | Apr 1952 | |
| 2788713 | Ever | Apr 1957 | |
| 3501996 | Lipp et al. | Mar 1970 | |
| 3986432 | Schreckenberg | Oct 1976 | |
| 4318331 | Echtler et al. | Mar 1982 | |
| 4324169 | Ruttgerodt | Apr 1982 | |
| 4391179 | Tidstrom | Jul 1983 | |
| 4457209 | Scheurich et al. | Jul 1984 | |
| 4648305 | Elspass | Mar 1987 | |
| 4671164 | DeHaven et al. | Jun 1987 | |
| 4706544 | Zielinski et al. | Nov 1987 |
| Number | Date | Country |
|---|---|---|
| 251176 | Mar 1911 | DE2 |
| 2027586 | Dec 1970 | DEX |
| 2330196 | Jan 1975 | DEX |
| 3041866 | Jun 1982 | DEX |
| 3046642 | Jul 1982 | DEX |
| 3132631 | Mar 1983 | DEX |
| 3132912 | Mar 1983 | DEX |
| 2444247 | Aug 1980 | FRX |
| 471363 | May 1969 | CHX |
| Entry |
|---|
| Pan, Army Research, Development and Acquisition Magazine, 10/83, pp. 15-17. |