Movable from a working position to a non-working position

Official title: movable from a working position to a non-working position {(movable arrangements of propellers in general B63H5/125; outboard propulsion units in general B63H20/00; steering or dynamic anchoring by propellers used therefore only, or by rudders carrying propellers B63H25/42)}

B63H5/20 (Movable from a working position to a non-working position) appears on 9 US grants and 10 published applications in this corpus.