Patent Model - Improvement in Steam-Pumps
Maker and role
David Douds (b.1830, d.1894), Patentee
John Hartsuff (b.1823, d.1895), Patentee
David Douds (b.1830, d.1894), Assignor
John Hartsuff (b.1823, d.1895), Assignor
Perry Douds (b.1837, d.1904), Assignee
Production date
Mar 03 1874
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