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| Patents for Mary Elizabeth Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 697,516 | Apr. 15, 1902 | O.F. Mossberg | Firearm-lock | shotguns | |
| 697,517 | Apr. 15, 1902 | O.F. Mossberg | Revolving firearm | revolvers | |
| D48,218 | Nov. 30, 1915 | T.F. Bowker | Design for a Screw Driver | screwdriver handles | |