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Patents for Arthur Letherby
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	684,433	Oct. 15, 1901	H.R. Isler	Differential Speed Mechanism
	704,645	Jul. 15, 1902	H.R. Isler	Differential Speed Mechanism
	802,489	Oct. 24, 1905	H. Baerbalck	Speed-changing device

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