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Patents for J. F. Duby
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,365,468	Jan. 11, 1921	J.F. Duby	Valve Spring Lifter
	CA-229,008	Feb. 27, 1923	J.F. Duby	Valve Spring Lifter

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