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| All Patents in class 228/190 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,981,915 | Nov. 27, 1934 | A. Hormel, W. Russell | Manufacture of metal ware | ||
| 2,871,886 | Feb. 03, 1959 | N.V. Gusching, J. Obreski | Manifold | ||
| 2,871,887 | Feb. 03, 1959 | N.V. Gusching, J. Obreski | Manifolding | ||