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| All Patents in class 137/177 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,950,227 | Mar. 06, 1934 | R.F. Chevalier | Condensation drainer | |
 | 2,020,563 | Nov. 12, 1935 | R.C. Moore | Condensate removing device | |
 | 2,636,506 | Apr. 28, 1953 | C.W. St. Clair | Strainer-equipped condensation drainer | |