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The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See
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March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as
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If the file has been modified from its original state, some details may not fully reflect the modified file.
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The following pages on the
English Knowledge use this file (pages on other projects are not listed):
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The original patent contains no such notice, so its contents are in the public domain.
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Click on a date/time to view the file as it appeared at that time.
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Add a one-line explanation of what this file represents
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Commons is a freely licensed media file repository.
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Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
