A phaser cannon was a type of phaser weapon that could be mounted aboard starships, ground vehicles, or used as a ground based weapon.
In the year 2364, the crew of the USS Centurion deployed tripod mounted phaser cannons to the surface of Tenara in order to fight off attacks by the M'dok. (TNG novel: The Captains' Honor)
In 2371, the Defiant-class, which was equipped with four pulse phaser cannons entered service. (DS9 reference: Star Trek: Deep Space Nine Technical Manual)
In 2380, the Vesta-class, which was equipped with experimental Mark XII phaser cannons entered service. (ST - Destiny novel: Mere Mortals)
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