Background Cardiac implantable electric devices are commonly used to treat heart failure. Little is known about temporal and geographic variation in use of cardiac resynchronization therapy (CRT) devices in usual care settings.
A hammer drill, also known as a rotary hammer, roto-drill or hammering drill, (see also rotary drill) is a rotary drill with a hammering action. The hammering action provides a short, rapid hammer thrust to pulverize relatively brittle material and provide quicker drilling with less effort.
Rehammering or hammer replacement is replacing the piano's hammers ( the felts which strike the strings), usually as a complete set. A piano's hammers are the felts subject to the greatest wear, much like the tires on a car. After so many years of use, they wear out, and need to be replaced.