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| All Patents in class 409/329 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,661,016 | Feb. 28, 1928 | W.J. Smith | Hydraulic Operating Means | metal shapers | |
| 2,167,890 | Aug. 01, 1939 | P.S. Jackson | Hydraulic Machine Tool | hydraulic apparatus | |