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| All Patents in class 29/406 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,024,020 | Dec. 10, 1935 | E.H. Aldeborgh | Dimension Gauge | ||
| 2,235,450 | Mar. 18, 1941 | W.L. Groene | Crankshaft Blank | crankshafts | |
| 2,333,859 | Nov. 09, 1943 | W.L. Groene | Crankshaft Blank | crankshafts | |