A pivot joint assembly has a first part with a hole. A content selection unit is operated by the user to select a desired one of the music content data from the plurality of the music content data. The total area of the holes is more than 0.
Algorithmically generated prior art
A pivot joint assembly has a first part with a hole. A content selection unit is operated by the user to select a desired one of the music content data from the plurality of the music content data. The total area of the holes is more than 0.