Rig design was patented 1938, see United States Patent 4367688 "Sailboat were having twin booms, DOUBLED sail and rotatable mast Permits Conventional sailing with bothering booms and sail sections on Sami thanks or with booms spread, wing and wing, to run before the wind or on a reach.
The Ljungström rig was easy to handle but got no more widespread among sailboat manufacturers as sailing at full and broad reach were less efficient than rigs with a jib and boom that provides a better air flow.