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| Patents for Harold F. Massey | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-189,517,390 | Jul. 25, 1896 | H.F. Massey | Improvements Relating to the Apparatus Employed in Operating the Valves of Steam-hammers, the Valves of which are or may be Arranged to be Worked by the Attendants in Charge thereof. | steam hammers | |