This work has been released into the public domain by its author, This illustration was published in US Patent 4,563,997. According to consensus reached in Wikimedia Commons that makes it belong to public domain.. This applies worldwide. In some countries this may not be legally possible; if so: This illustration was published in US Patent 4,563,997. According to consensus reached in Wikimedia Commons that makes it belong to public domain. grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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