There is nothing either bad or good about the Grashof condition. Linkages of all
three persuasions are equally useful in their place. If, for example, your need is for a
motor driven windshield wiper linkage, you may want a non-special-case Grashof crankrocker
linkage in order to have a rotating link for the motor's input, plus a special-case
parallelogram stage to couple the two sides together as described above. If your need is
to control the wheel motions of a car over bumps, you may want a non-Grashof triplerocker
linkage for short stroke oscillatory motion. If you want to exactly duplicate some
input motion at a remote location, you may want a special-case Grashof parallelogram
linkage, as used in a drafting machine. In any case, this simply determined condition tells
volumes about the behavior to be expected from a proposed fourbar linkage design prior
10 any construction of models or prototypes.