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Patents for H. J. Spooner
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
RE4,197Dec. 13, 1870S. DarlingImprovment in Inkstandsdraftsman
111,435Jan. 31, 1871S. DarlingImprovment in Inkstandsdraftsman
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