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| All Patents in class 137/601.18 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,417,217 | Mar. 11, 1947 | H. Schreck | Fluid Flow Control Device | ||
| 2,555,576 | Jun. 05, 1951 | A.E. Criqui | Axial flow fan | ||