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File : Tugboat diagram-en edit.svg - Wikimedia
File:Tugboat diagram-en.svg - Wikimedia Commons
Tugboat - Wikipedia
The Ultimate Guide to Tug Boats - Marine Insight
Category:Tugboat diagrams - Wikimedia Commons
File:Tugboat diagram-en.svg - Wikipedia
File:Tugboat diagram-en edit1a.svg - Wikipedia
A typical profile drawing of a tugboat (Credit: Sanmar Shipyard)