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| All Patents in class 428/582 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,303,829 | May 13, 1919 | G.A. Vogel | Stock for Spirit Levels | metallic levels | |
| 1,990,670 | Feb. 12, 1935 | H.V. Rau | Sheet metal cap | ||
| 2,197,076 | Apr. 16, 1940 | W.R. Meyer, W.F. Groene | Crankshaft Blank | crankshafts | |
| 2,235,450 | Mar. 18, 1941 | W.L. Groene | Crankshaft Blank | crankshafts | |
| 2,333,859 | Nov. 09, 1943 | W.L. Groene | Crankshaft Blank | crankshafts | |