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All Patents in class 324/90
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	540,153	May 28, 1895	M. von Dolivo-Dobrowolsky	Apparatus for determining differences between phases of two electric alternating currents
	549,449	Nov. 05, 1895	M. von Dolivo-Dobrowolsky	Apparatus for indicating difference of phase

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