Today in 1952, US Patent 2620961 A was issued, another invention of Eugene A. Wahl and Ralph J. Winters, assigned to Ballantine & Sons, for their “Carton Flap Opener.” There’s no Abstract, although in the description it includes this summary:

The present invention relates generally to a method and apparatus for inspecting the interior and/or contents of cartons, or for filling and emptying cartons, and more particularly to a method and apparatus for unfolding the carton fiaps from folded closed position to unfolded open position to automatically have access to the interior of the carton for any desired purpose.