Image: 1860s external frame packs
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Description: Two external frame knapsack designs from the 1860s Captioned As {
Title: 1860s external frame packs
Credit: Transferred from en.wikipedia to Commons. (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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License: Public domain
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