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All Patents of Type: rpm speed gauges and tachometers
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
139,184May 20, 1873J.W. OsborneSpeed Gagerpm speed gauges and tachometers
705,514Jul. 22, 1902H.S. CredlebaughSpeed Gagerpm speed gauges and tachometers
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