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All Patents in class 33/292
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	18,728	Dec. 01, 1857	C. Becker	Surveying Level
	60,788	Jan. 01, 1867	W.L. Richardson	Sighting Level
	234,709	Nov. 23, 1880	J.W. Harmon	Leveling-Instrument

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