All Patents in class 73/709


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All Patents in class 73/709
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	129,958	Jul. 30, 1872	J.P. Holt	Improvement in Registering Steam-Gauges
	794,054	Jul. 04, 1905	G. Spencer	Pressure Gage
	1,641,838	Sep. 06, 1927	H.J. Burkhardt	Pressure gauge