????? ????? ?????? ???? ????? ?????? ????? ????? ??????? ?????? ?? ???????. ?????? ??? ?????. ??? ??????? ? ????? ?? ??? ??????? ?? ?????? ?? ????? ?? Two levers, or cranks, are combined into a planar four-bar linkage by attaching a connection that connects the output of 1 crank towards the enter of Yet another. Additional backlinks is usuall