GATE VALVE FORMED WITH CLOSING WEDGE BLOCK COVERED BY ELASTIC MATERIAL
KOVACS,LASZLO,HU, SIPOS,KAROLY,HU, MAUS,PETER,HU, TAKACS GEB PALOS, GABRIELLA,HU, SZOEKE,NANDOR,HU
Year of Publication 28.10.1977
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Year of Publication 28.10.1977
Patent