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| Patents for Harry R. Illingworth | |||||
| Number | Date | Patentee | Title | Type | |
| 334,778 | Jan. 26, 1886 | H.R. Illingworth, J.J. Illingworth | Steam Engine Recorder | industrial recording apparatus | |
| 334,779 | Jan. 26, 1886 | H.R. Illingworth, J.J. Illingworth | Steam Engine Recorder | steam engine indicators | |