Abstract: A machine is positioned in the line of a gypsum board manufacture to provide lifting arms, which are actuated up through the line to remove board sections, invert and transfer them to an adjacent area for subsequent drying. The lifting arms are reciprocated, end for end, during the elevating and inverting action to subsequently approach the board from beneath. The lifting arms are actuated through slider boxes, attached to a shaft, and a cam is provided to control the ends of the lifting arms, as each end is pivoted at the inverter shaft to which its slider box is attached.