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Patents for Hugh De Haven
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	454,738	Jun. 23, 1891	E.F. Holmgreen	Rotary Engine
	2,710,649	Jun. 14, 1955	H. De Haven, R.W. Griswold, II	Combination Shoulder And Lap Safety Belts

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