| Number | Name | Date | Kind |
|---|---|---|---|
| 991192 | Battenfeld | May 1911 | |
| 1088530 | Buse | Feb 1914 | |
| 1294854 | Welter | Feb 1919 | |
| 2029707 | Dodelin | Feb 1936 | |
| 2915799 | Andreasen | Dec 1959 | |
| 2919017 | Weber | Dec 1959 | |
| 2985349 | McGuire | May 1961 | |
| 3204775 | Smith et al. | Sep 1965 | |
| 3227411 | Treutler | Jan 1966 | |
| 3336643 | Robison | Aug 1967 | |
| 3429542 | Fagan | Feb 1969 | |
| 4005844 | Richmond | Feb 1977 | |
| 4049164 | Sullivan et al. | Sep 1977 | |
| 4213592 | Lingenfalser | Jul 1980 | |
| 4304383 | Huston | Dec 1981 | |
| 4341267 | Lagasse | Jul 1982 | |
| 4505448 | Massie | Mar 1985 |
| Entry |
|---|
| Photographs of four (4) prior art devices. |