Class 11: The shortest link is ground, and each link makes a full revolution. This is the
Special Case version of the Class 1 Grashof linkage.
Class 12: The shortest link is the crank, and only the crank makes a full revolution. This is the
Special Case version of the Class 2 Grashof linkage.
Class 13: The shortest link is the coupler, and only the coupler makes a full revolution. This is the
Special Case version of the Class 3 Grashof linkage.
Class 14: The shortest link is the rocker, and only the rocker makes a full revolution. This is
the Special Case version of the Class 4 Grashof linkage.