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D7 Type Battle Cruiser Side View:

The D7 type battle cruiser were in service in the 2260s, and is a design shared with the Romulan Star Empire (Romulan battle cruiser), from a brief alliance between the two powers in 2268. These vessels, some 228 meters in overall length, are equipped with a warp drive and phase-disruptor armament. Later, in the 2280s, an upgraded version of the D7 type were introduced into service in the Klingon Defense Force, and is known as K't'inga class battle cruisers. First seen in "The Enterprise Incident" (TOS).