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| All Patents in class 33/824 | |||||
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| Number | Date | Patentee | Title | Type | |
| 817,492 | Apr. 10, 1906 | P. Layman | Gage | measurement gauges | |
| 1,335,004 | Mar. 30, 1920 | D.H. Lehigh | Micrometer and Height Gage | micrometers | |
| 1,576,797 | Mar. 16, 1926 | G. Schustarich | Precision Measuring Instrument | micrometers | |
| 1,603,663 | Oct. 19, 1926 | L.A. Cooper | Adjustable Reversable Micrometr Caliper | measurement gauges | |
| 1,829,323 | Oct. 27, 1931 | U.A. Frederick, V.F. Witter | Micrometer | micrometers | |