Furling mandrel in mast with Integral track for storm trysail.
Both in-mast and behind the-mast furling systems from Selden and its Furlex subsidiary. 12-page brochure in .pdf file. One of their systems permits mast bend without binding.
Furling system within the mast based on an endless screw. One line turns the screw, another controls the outhaul.
Behind-the-mast roller-furling for mainsails.
Manual and electric in-mast and behind-mast furlers from Italy. Also electric motors for existing mainsail furlers, and as system to synchronize the winding motor and the outhaul.