| http://www.w3.org/ns/prov#value | - es formed at side edges of the metal sheet web, the same lead and trail notches also defining the male and female portions of each duct blank.These and other advantages of the present invention will be better understood in view of the Drawings and description of a preferred embodiment.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a top or plan view of a schematic diagram illustrating a line of equipm
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