Abstract: An assembly comprising a propeller blade and its system for angularly adjusting the pitch of the blade including a bowl which is radially delimited by an annular wall extending about an axis for adjusting the pitch of the blade, the bowl having a bottom wall, a free lower end of the root being fitted axially into a complementary housing of the bottom wall in order to rotatably connect the bowl and the blade about the pitch-adjustment axis. The root of the blade comprises a first limiting face that engages with a first abutment face of the bowl to limit the rotation of the blade in the event of breakage of the lower end of the root.

Abstract: A mute made of a block of sound-deadening thermoplastic elastomer having a longitudinal slot for placing over the top edge and portions of the surface of a string musical instrument bridge. Cut-out portions are provided forming slots for passage over the strings, the end of the cut-out portions or slots following generally the contour of the top edge of the bridge. The mute dampens the bridge vibrations and deadens the sound transmitted from the strings to the musical instrument soundboard via the bridge.