| 摘要 |
A support beam has a flat elongated metallic bar having a vertically oriented wide width dimension and a horizontally oriented narrow thickness dimension, and a mass of plastic substantially completely surrounding the bar and forming an upwardly directed face adapted to bear on and support a sieve-panel rim and an upwardly projecting formation interfitting with the rim. The bar in accordance with the invention is oriented centrally underneath the formation and the mass forms a pair of coplanar and adjacent support faces flanking the formation and each adapted to support a respective sieve-panel rim.
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