Number | Name | Date | Kind |
---|---|---|---|
1443231 | McCauley | Jan 1923 | |
2198455 | Mueller et al. | Apr 1940 | |
3954250 | Grace | May 1976 | |
4022243 | Edwards | May 1977 | |
4066090 | Nakajima et al. | Jan 1978 | |
4117856 | Carlson | Oct 1978 | |
4809732 | Buehler | Mar 1989 | |
5004157 | Martell | Apr 1991 |
Entry |
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Cross Connection Control Handbook; Febco; Water Systems, Inc.; 1977; pp. 1-12. |
Backflow Prevention Assemblies; Febco; Water Systems, Inc.; Dec., 1991. |
78-664/666 Series; Standard Port Bronze Apollo with Center Drain; 78-668 The 1/2" Bronze Purge & Drain Ball Valves. |