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portion; one of said constituent parts hav- ing a projection in its. interior. slanting toward the axis of the tubular portion and away from the head-engaging end of the 5 tubular portion; and a wedge in the tubular portion, the wedge. being engaged with the projection..
In. testimony that I claim the foregoing as my. own,. I have, hereto affixed my signa ture in the presence of two witnesses. WILLIAM EDWARD BURKS. Witnesses: .WALTM. MARTIN, W. E. JORDAN.