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| Patents for William Helmer | |||||
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| Number | Date | Patentee | Title | Type | |
| 198,909 | Jan. 01, 1878 | T. Bedworth, F.T. Ward | Improvement in Spirit Levels | levels | |
| 1,289,765 | Dec. 31, 1918 | F.H. Hood | Attachment for Meat Grinder | meat grinders | |