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A.U.'s anvil roll Bajrakot current cross ripple mark davyhume Erft H. M. G. like all nature lockabler magnolia diva stapf martensia flabelliformis reduced ternary quadratic form seal by bimetallic O-ring with teflon selected X error bars starres trim-tram Turner's Pen. wheat leaf-sheath assay X-ray monochrometer yuksporite