“concave” type

Abney mounting for concave grating

absolutely concave function

annular concave spherical surface

belt conveyor + concave segment + curvature radius

bi-row concave ridge

blade with concave surface

central concave abrasive

characteristic concave or convex of surface

Circular concave sound source

cold extrusion concave die

Combination Concave Die

combined concave mold

composed concave die

compound concave die

concave and convex operator

concave and convex property

Concave and Raised Surface

concave angle