I want to ask about a piece of machinery that looks like a handheld jackhammer, but instead of a chisel it has something that looks like a square plate, i dont know if it is pneumatic or electric, but i am sure that it operates the same way with a jackhammer. Does anyone know its name?
It sounds like you are talking about a pneumatic tamper or 'back-fill tamper', used to press down and compact the earth following road works and pipe laying, things like that.
