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| All Patents in class 428/583 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,197,076 | Apr. 16, 1940 | W.R. Meyer, W.F. Groene | Crankshaft Blank | ||
| 2,235,450 | Mar. 18, 1941 | W.L. Groene | Crankshaft Blank | ||
| 2,359,477 | Oct. 03, 1944 | J.H. Hoern | Method of Making Hollow Head Valves | ||
| 3,058,205 | Oct. 16, 1962 | B. Sassen, C.L. Sporck | Lightweight Plurality of Generally Conical, Hollow, Metallic Objects | ||