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tion of channel guides of substantially U- shaped cross section adapted to be mounted on the inner edge of the sash frame and abut against the inner and outer surfaces of the 5 glass pane, pulleys placed in alinement with said guides, of slide blocks confined within the channels, a cord connecting the slide
blocks and passing over the pulleys, and a wiper extending across the pane to be wiped and carried by the slide blocks. 10 In testimony whereof I hereunto set my hand. - JOHN G. RANDALL.