Key-locking nut device, 19th century

Key-locking nut device, 19th century

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Credit: SCIENCE PHOTO LIBRARY

Caption: Key-locking nut device. 19th-century artwork showing the mechanism for a powerful key-locking nut fastening device with cogs and screw threads. Artwork from the 22nd volume (second period of 1898) of the French popular science weekly 'La Science Illustree'.

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