US D242616 S
FIG. 1 is a view in rear perspective of the ship propeller duct.
FIG. 2 is a view in front perspective thereof.
FIG. 3 is a view in cross-section of the ship propeller duct.
FIG. 4 is a view in side elevation of FIG. 3.
The broken line disclosure of a propeller and shaft is for illustrative purposes only.