Number | Name | Date | Kind |
---|---|---|---|
3638362 | Stoll et al. | Feb 1972 | |
3932963 | Hutchins | Jan 1976 | |
4184291 | Martin | Jan 1980 | |
4296572 | Quintana | Oct 1981 | |
4671019 | Hutchins | Jun 1987 | |
4671020 | Hutchins | Jun 1987 |
Entry |
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Advertising Leaflet of Hutchins Manufacturing Company. |
Photographs of the Butterfly Valve Element and Aspirator Block. |