US Patent 10386182 Carbon fiber composite level and method of manufacturing same

A level comprising a level body, and at least one bubble vial mounted on the level body is provided. The level body has a generally tubular configuration including a top wall and a bottom wall generally parallel to one another, and a pair of spaced side walls; a top opening in the level body that interrupts at least a portion of the top wall to accommodate the at least one bubble vial; and an internal support structure disposed within the tubular configuration of the level body and spanning longitudinally along the level body so as to be disposed on both sides of the top opening to provide structural support to the level body in the vicinity of the top opening.