All Patents in class 156/257


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All Patents in class 156/257
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	161,746	Apr. 06, 1875	W.E. Brock	Improvement in lumber
	4,920,723	May 01, 1990	D.R. Porter	Hollow Granite Box Beam and Method of Forming