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| All Patents in class 73/744 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,280,354 | Oct. 01, 1918 | W.P. Holden, C.J. Zigler | Compression Recorder | internal combustion engine indicators | |
| 1,467,558 | Sep. 11, 1923 | J. Okill | Pressure Indicator for Internal Combustion Engines and the Like | vacuum and pressure gauges | |