6. Converse anti-parallel cranks . ( C 2 ″ < C 2 ″ ) a = c {\displaystyle \left({C''_{2}}<{C''_{2}}\right)^{a=c}}
7. Isosceles double-crank . . . ( C 2 ″ ) ≤ C 2 ″ ) d = a {\displaystyle \left({C''_{2}})\leq {C''_{2}}\right)^{d=a}}
8. Isosceles double-lever ( C 2 ″ ) ≤ C 2 ″ ) b = c {\displaystyle \left({C''_{2}})\leq {C''_{2}}\right)^{b=c}}
B Slider-Crank Chain ( C 3 ″ P ⊥ ) {\displaystyle (C''_{3}P^{\bot })}
9. (Turning) slider-crank ( C 3 ″ P ⊥ ) d {\displaystyle (C''_{3}P^{\bot })^{d}}
10. Swinging block (slider-crank) ( C 3 ″ P ⊥ ) b {\displaystyle (C''_{3}P^{\bot })^{b}}
11. Turning block (slider-crank) ( C 3 ″ P ⊥ ) a {\displaystyle (C''_{3}P^{\bot })^{a}}