Today in 1939, US Patent 2156951 A was issued, an invention of Henry Mondloch, assigned to the Hansen Canning Machinery Corp., for his “Can Filling Machine.” There’s no Abstract, but they state in the description that the “present invention relates generally to improvements in the art of packing successive batches of commodity in receptacles, and relates more specifically to improvements in the construction and operation of so-called can filling machines of the automatic type.”