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| Patents for John L. Lay | |||||
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| Number | Date | Patentee | Title | Type | |
| 66,972 | Jul. 23, 1867 | J.L. Lay | Compound Steam Engine | steam engines | |
| 66,973 | Jul. 23, 1867 | J.L. Lay | Steam Engine | steam engines | |
| 66,975 | Jul. 23, 1867 | J.L. Lay | Compound Steam Engine | compound steam engines | |