Number | Name | Date | Kind |
---|---|---|---|
2820241 | Schlage | Jan 1958 | |
3114541 | Coffey | Dec 1963 | |
3874117 | Boehm | Apr 1975 | |
4658545 | Ingham et al. | Apr 1987 |
Number | Date | Country |
---|---|---|
842533 | May 1970 | CAX |
2405281 | Aug 1975 | DEX |
Entry |
---|
Roto Swing, Inc. brochure, U.S.A. Models 1, and 2, date not known but at least as early as Dec., 1986. |