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| All Patents in class 91/23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 130,099 | Aug. 06, 1872 | O. Adams | Puppet-valves | steam engine valves | |
| 942,756 | Dec. 07, 1909 | W. Norris, T. Scott-King | Power Hammer | power hammers | |