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All Patents in class 175/395
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
51,980	Jan. 09, 1866	W.W. St. John	Drill-head
90,787	Jun. 01, 1869	W.P. Smith, L.M. Rumsey	Improved drill for rock and earth with attached tube

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