[n: Two Levels Are Symmetric, In Respect Of The Sign To The Third Level Which Is "zero"] {g11b 20/14b1} Patents and Patent Applications (Class G9B/20.043)

[n: Two Levels Are Symmetric, In Respect Of The Sign To The Third Level Which Is "zero"] {g11b 20/14b1} Patents (Class G9B/20.043)

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