FIELD: mining.
SUBSTANCE: group of inventions relates to mining and can be used in a downhole apparatus or tool. Downhole apparatus or tool comprises a seat configured to receive an object, for example a ball. Seat comprises a convex object engaging surface for blocking an object. Said convex object engaging surface comprises a plurality of segments.
EFFECT: technical result consists in preventing the swaging, jamming or lodging of the object in the seat.
35 cl, 36 dwg
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