Patents for William L. Trill


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Patents for William L. Trill
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,028,154	Jun. 04, 1912	W.L. Trill	Continuous Indicator for Engines
	1,028,155	Jun. 04, 1912	W.L. Trill	Continuous Indicator for Engines
	1,056,950	Mar. 25, 1913	J.W. Sheperdson	Engine Indicator