Number | Name | Date | Kind |
---|---|---|---|
3200734 | Burns et al. | Aug 1965 | |
3356006 | Scott | Dec 1967 | |
3548735 | Sweeney | Dec 1970 | |
4664022 | Oddenino | May 1987 | |
4669370 | Hildebrand et al. | Jun 1987 | |
4702155 | Hildebrand et al. | Oct 1987 |
Number | Date | Country |
---|---|---|
38347 | Feb 1986 | JPX |
Entry |
---|
"Improved Ventilating Register", Iron Age, Aug. 23, 1988 p. 296. |