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Patents for John Holroyd
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
600,107	Mar. 01, 1898	J. Holroyd, E. Wiseman	Hydrocarbon Motor	oil engines
600,974	Mar. 22, 1898	E. Wiseman, J. Holroyd	Hydrocarbon Motor	oil engines

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