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Patents for Henry J. Betjemann
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
6,668Aug. 28, 1849J. Garside, H.J. BetjemannMachinery for cutting screws in bedsteadsspecialty woodworking machines
7,807Dec. 03, 1850H.J. BetjemannMachine for boring dovetailed mortisesmortising machines
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