Q22907967: Difference between revisions
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Latest revision as of 20:16, 17 February 2025
The Drzewiecki drop collar was an external torpedo launching system most commonly used by the French and Imperial Russian Navies in the first two decades of the 20th century. It was designed by Stefan Drzewiecki, a Polish engineer and inventor. He designed and built the first submarine in the world with electric battery-powered propulsion (1881).