3 Jan 1829 Jahr - First Snagboat invented.

Beschreibung:

These boats patrolled the rivers and removed snags so other boats would not hit them and sink. A snag is a sunken tree, stump, or boat wreck that could cause damage to a ship if hit.

http://www.usace.army.mil/About/History/Historical-Vignettes/Civil-Engineering/120-Snagboats/

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