English: Two external frame knapsack designs from the 1860s
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(Original text : Knight's American Mechanical Dictionary: A Description of Tools, Instruments, Machines, Processes, and Engineering; History of Inventions; General Technological Vocabulary; and Digest of Mechanical Appliances in Science and the Arts
By Edward Henry Knight
Published by Hurd and Houghton, 1876)
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Two external frame knapsack designs from the 1860s Knight's American Mechanical Dictionary: A Description of Tools, Instruments, Machines, Processes, and Engineering; History of Inventions; General Technological Vocabulary; and Digest of Mechanical Appli
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