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All Patents in class 55/457
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	400,391	Mar. 26, 1889	E. Bretney	Dust-collector
	943,233	Dec. 14, 1909	J. Boyle	Exhaust-muffler
	2,732,032	Jan. 24, 1956	A.G. Sandison	Dust collector

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