Some early hand-cranked saws driven by chains were invented in the 18th century for the "symphysiotomy and excision of diseased bone respectively." In some cases, these saws were used to break through ...

Some early hand-cranked saws driven by chains were invented in the 18th century for the "symphysiotomy and excision of diseased bone respectively." In some cases, these saws were used to break through ...

A chain saw can be an intimidating power tool, and to be safe you have to learn how to handle one. Maintaining a gas-powered handheld chain saw takes some expertise—you need to keep the chain ...