E3 industrial

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{{Information
|attention=
|description=Fan-made gas mask Citizen model, based on textures of the missing model "Citizen 17".
|source=Half-Life 2 Beta|''Half-Life 2'' Beta
|author=
|filespecs=
|licensing={{Gamescreenshot}}
|other versions=
|cat artist=
|cat subject=CategoryGas Mask Citizen images
|cat type=CategoryHalf-Life 2 Beta screenshotsCategoryLost Concept screenshots
}}