All Patents in class 173/20


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All Patents in class 173/20
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	643,083	Feb. 06, 1900	M.C. Bullock, deceased (Estate of), M.A. Bullock, Executrix	Thrust Register for Drilling Machines
	921,736	May 18, 1909	J. Pryke, J. Tweedale	Pantograph Engraving Machine
	RE12,990	Jul. 13, 1909	J. Pryke, J.T. Rawsthorne	Pantograph Engraving Machine