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All Patents in class 29/455.1
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	2,135,441	Nov. 01, 1938	L.L. Schauer	Welded bitubular column
	2,828,531	Apr. 01, 1958	C.J. Bath	Method of Making a Helicopter Blade

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