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| All Patents in class 33/825 | |||||
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| Number | Date | Patentee | Title | Type | |
| 495,915 | Apr. 18, 1893 | F. Spalding | Micrometer Gage | micrometers | |
| 747,224 | Dec. 15, 1903 | A. Rieffel | Micrometer Gage | micrometers | |
| 842,263 | Jan. 29, 1907 | F. Spalding | Micrometer Calipers | inside micrometers | |
| 898,972 | Sep. 15, 1908 | H.O. Costello | Quick-adjusting Micrometer | micrometers | |
| 1,034,795 | Aug. 06, 1912 | N. Helwig | Calipers | indicating calipers | |
| 1,504,680 | Aug. 12, 1924 | J. Fernandez | Adjustable Micrometer | micrometers | |