[n: For The Vertical Movement Only] {g11b 3/085b2a1c1} Patents (Class G9B/3.036)

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[n: using mechanical means] {g11b 3/085b2a1c1a} (Class G9B/3.037)
[n: using electrical/magnetic means] {g11b 3/085b2a1c1b} (Class G9B/3.038)

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