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File:U-Boat 110, Diesel Engine Room. (8770729394).jpg - Wikimedia Commons
WW1 U Boat Engine : r/MachinePorn
German U-Boot Diesel MWM RS 34 S running smoothly at Maschinenmuseum Kiel - YouTube
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U-Boot Type 206 German Diesel Electric Submarine - Scale Model
mtu Marine U-Boot-Motoren
File:Typ XXI - Wilhelm Bauer - Bremerhaven 17.jpg - Wikimedia Commons
Antique Machinery and History | U-Boat engine question- what do these things do? | Practical Machinist - Largest Manufacturing Technology Forum on the Web
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U-Boot Type XXI in Detail, Part II – IPMS Stockholm
U-96 / Das Boot Museum at Bavaria Studios - The Galleries - uboat.net
Underwater
