Vibrosaw

A vibrosaw was a type of cutting technology used in the 23rd century.

Specifics
A vibrosaw employs highly-focused ultrasonics as a means of slicing or penetrating objects. Two power cells with high levels of output provide energy for six hours. A vibrosaw is often used during survival situations. 

Fifty trees 15-25 centimeters in diameter could be cut down with one vibrosaw in an hour.

Uses
In 2269, survival gear on the planet Anomaly stored in several stranded shuttlecraft from the starship USS Enterprise (NCC-1701) included at least six vibrosaws. These were used to fell trees for building a stockade intended to provide long-term defense against dangerous Mesozoic Era-like animal life. Leonard McCoy helped cut down some of the trees, and had gotten so carried away that he accidentally dropped a tree on Captain James T. Kirk. Luckily, Kirk was wearing body armor which prevented any physical injury. 

Connections

 * See also: sonic hammer, sonic screwdriver, vibroknife