Pressure reducer for connecting and defining of HP section and LP section in fluid pipe has helical form multiple flow path extension between HP and LP section between cylinder inner wall and piston or threaded pin installed inside it
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Method of sending greetings card or small gift to pre-given address entails fastening object to newspaper or magazine delivered by newspaper boy or girl
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Device for sealing pipeline leak
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Pipeline leak sealing device
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Radially expansible stopper for inlet and outlet holes
