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| All Patents in class 137/198 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 540,760 | Jun. 11, 1895 | S. Sawyer | Automatic air and vacuum valve | ||
| 2,208,181 | Jul. 16, 1940 | L.W. Eggleston | Vacuum Air Valve | ||
| 2,299,473 | Oct. 20, 1942 | L.W. Eggleston | Valve | ||