liittoimevasar, mille langevad osad tõstetakse ja lisaks kiirendatakse pneumaatiliselt s.t suruõhuga (vt liittoimevasar), a type of drop hammer in which the ram is raised for the each stroke by a double-action air cylinder and the energy delivered to the workpiece is supplied by the velocity and weight of the ram and attached upper die driven downward by air pressure (see: power-driven hammer)