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822,343 8 of rotation of the piston-drum, a pivotally- my own I have hereto affixed my signature in mounted piston-wing carried by the drum, the presence of two witnesses. and yieldable members adjacent to said in- clined shoulder, and with which the wings 5 engage as they pass from operative position Witnesses: to be folded against the piston-drum. J. M. MOOSE, In testimony that I claim the foregoing as W. T. RoussEAU.