The ornamental design for a crownstiffener with subsidiarystiffener, as shown and described.
FIG. 1 is a front perspective view of a crown stiffener with subsidiary stiffener;
FIG. 2 is a rear perspective view thereof; and,
FIG. 3 is another front perspective view of a crown stiffener with subsidiary stiffener.
The two broken lines that occur along the edges of the central seam in FIG. 1 and the three central, vertical broken lines in FIG. 2 represent stitching but form no part of the claimed design.
The broken lines in FIG. 3 are for the purpose of illustrating the environment in which the design is associated and form no part of the claimed design.