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| All Patents in class 73/114.14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,645,118 | Jul. 14, 1953 | J.H. Andresen | Power-Time Recorder | internal combustion engine indicators | |
| 2,869,962 | Jan. 20, 1959 | R.C. Baird | Self-Synchronizing Horse Power Indicator | internal combustion engine indicators | |