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| All Patents in class 346/150.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 991,843 | May 09, 1911 | J.F. Gill | Engine Indicator | steam engine indicators | |
| 1,655,615 | Jan. 10, 1928 | P. Kreisel | Recording and Timing Device for Combustion Engines | internal combustion engine indicators | |
| 3,127,613 | Mar. 31, 1964 | T.A. Stoner, T.A. Wetzel | Method and Apparatus for Recording a Control Program | numerically controlled milling machines | |