Patents for Henry Bolthoff


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Patents for Henry Bolthoff
Patents 16 - 17 of 17
Number	Date	Patentee	Title	Type
1,327,902	Jan. 13, 1920	H. Bolthoff	Concentrator	ore processing apparatus
1,332,595	Mar. 02, 1920	H. Bolthoff	Head-motion for concentrating-tables	ore processing apparatus