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Patents for William Ritchie
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
83,982Nov. 10, 1868W. Ritchie, A.C. MartinImprovement in head-blockssawmill headblocks
100,072Feb. 22, 1870W. RitchieImprovement in Instruments for Drawing Geometrical Linescompasses
RE7,242Jul. 25, 1876S.N. Brown, H.W. MeyerImprovement in feed and pressure rollers for planing-machineswood planers
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