FIELD: apparatus for chemical or physical processes.
SUBSTANCE: passage comprises front convex wall, back convex wall, and two convex sides. The walls and sides are made of grids defined by straight wires and bearing rods that are bent so that the walls and sides of the passage have openings throughout the periphery and are flexible along the radial direction of the passage.
EFFECT: enhanced strength.
6 cl, 6 dwg
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