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1,370,492
inclined annular seat, a sleeve threaded on the support and having an annular seat in- clined in a direction opposite to the collar seat, arcuate shanks disposed about the sup- 5 port and having oppositely inclined ends engaging the seats of the collar and sleeve, longitudinal blades carried by the shanks,
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and an advance drilling extension of less diameter than the blades depending from the support. In testimony whereof we affix our signa- tures. PRIMUS W. SMITH. JOHN J. BOOKHOUT