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| Patents for P. H. Lawler | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 33,153 | Aug. 27, 1861 | P.H. Lawler, J.B. Dougherty | Improvement in machines for forming barrel-heads | |
 | 58,729 | Oct. 09, 1866 | P.H. Lawler | Improvement in barrel-machines | |