improvements in or relating to equipment for excavation of inbocco

摘要

ritardatore mechanism which provides a delay between the application of a pressure to the mechanism and an action that is executed as a result of the application of such pressure.the mechanism may include a first plunger and a plunger chamber and a second piston chamber and a piston.the passage of a viscous fluid between the chambers of the piston can be obtained by at least one flow passage shaped.