Patents for Henry Crum


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Patents for Henry Crum
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
79	Nov. 14, 1836	H. Crum	Wood-screw-threading machine, &c.	wood threading machines
1,411	Nov. 16, 1839	H. Crum	Making wood screws	screw machines
AI28	Nov. 21, 1839	H. Crum	Making wood screws	wood threading machines