by magnetic or electromagnetic attraction ; (operation of locks or fasteners by electric or magnetic means E05B47/00)

Full Title

Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith (combined with hinges E05D11/00; combined with operating apparatus for wings E05F; other braking devices, stops, buffers E05F5/00) > by magnetic or electromagnetic attraction ; (operation of locks or fasteners by electric or magnetic means E05B47/00)