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All Patents in class 228/174
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
2,871,887	Feb. 03, 1959	N.V. Gusching, J. Obreski	Manifolding
3,470,598	Oct. 07, 1969	V. Berthelsen	Method of making structural elements

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