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All Patents in class 228/60
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	331,527	Dec. 01, 1885	C.W. Nason	Machine for Welding Plugs in the Ends of Tubes
	1,280,823	Oct. 08, 1918	H.W. Oster	Mechanism for closing and finishing the ends of metal tubes

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