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| Patents for F. G. Mangus | |||||
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| Number | Date | Patentee | Title | Type | |
| D59,926 | Dec. 06, 1921 | A.T. Richardson | Design for an Elevation Scale | ||
| D59,927 | Dec. 06, 1921 | A.T. Richardson | Design for an Inspector's Track Level and Gage | levels | |