air purification machine room the nazi german bunker from world war |
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| navigate by keyword : air airflow atmosphere bomb building bunker circulation clean cleaning control defense detail environment equipment fan filter filtering filters filtration fortification german historical infrastructure interior machine maintenance management mechanism military nazi objects parts pipeline process protection purification purify quality regulation room safety second system technology underground ventilation war wartime world |
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| Air purification machine room of the Nazi German bunker from World War II. Detail of a filtering machine. |
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