The trick is to use two tools together: locking pliers to grab the nail shank, and a pry bar to do the pulling. When the ...

A few examples are: locking pliers, bicycles, oil well pumps, loaders, internal combustion engines, compressors, and pantographs. In biology we can also find examples of this linkage, as in the ...

Hammer? Check. Screwdriver? Check. Pliers? Check. Locking mechanism that prevents unintended mishaps? Also check!