[GZG] Help identify more ships

Can you help me identify more ships:

NAC Frigate:
http://rlyehable.org/images/ft/forsale/nac%20unknown%201.jpg
NAC Battleship
http://rlyehable.org/images/ft/forsale/nac%20unknown%202.jpg
NAC Cruiser http://rlyehable.org/images/ft/forsale/nac%20unknown%203.jpg
ESU Corvette http://rlyehable.org/images/ft/forsale/esu%20unknown.jpg

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