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| All Patents in class 73/47 | |||||
| Number | Date | Patentee | Title | Type | |
| 1,467,558 | Sep. 11, 1923 | J. Okill | Pressure Indicator for Internal Combustion Engines and the Like | vacuum and pressure gauges | |
| 2,823,542 | Feb. 18, 1958 | M.K. Kuehl, G.M. Walraven | Compression Gauge for Internal Combustion Engines and the Like | ||