Abstract: A vibration dampening system includes a vibration dampening element for a turbine nozzle or blade. A body opening extends through the turbine nozzle or blade, e.g., through the airfoil among potentially other parts of the nozzle or blade. A vibration dampening element includes a plurality of stacked damper pins within the body opening. The damper pins include an outer body having an inner opening, a first end surface and an opposing second end surface; and an inner body nested and movable within the inner opening of the outer body. The end surfaces frictionally engage to dampen vibration. The inner body has a first central opening including a first portion configured to engage an elongated body therein and an outer surface configured to frictionally engage a portion of the inner opening of the outer body to dampen vibration.

Abstract: In a combination of a top bedsheet with a bottom bedsheet that is fitted to a mattress, the improvement consists of providing a row of at least 3 buttons uniformly spaced along the foot end, plus one additional button on each side spaced about 12 inches from the foot end. All buttons are aligned with the bottom-perimeter edge of the mattress and are sewn to the bottom bed sheet. The top bed sheet is provided with a row of buttonholes in the bottom hem, appropriately disposed to engage corresponding buttons of the bottom sheet. For waterbeds, where the bottom bedsheet customarily is provided with 4 triangular corner pockets to receive the 4 corners of the mattress, a row of buttons is sewn to that portion of the foot end hem which is confined between the two corner pockets. The buttons may be sewn through reinforcing strips and tabs.