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1,184,709 shoulder, said plug being secured 'within of 'said pipe section for locking said plug said aprture by upsetting the adjacent wall within said aperture. 10 of said'r'perture. testimony whereof I affix my signature 8..In a.well strainer, pipe section pro- in presence of two witnesses. - vided with.a. stepped aperture, a strainer JOSEPH H. MoEVOY. plug provided with slits seated within said- Witnesses: aperture, said plug hayingvan annular ra P. GEo. MGCKY, bet at one end to receive the upset portion HaARY S. GORDON.