[n: Specially Adapted For Spacing From Rotating Disc] {g11b 5/60d1} Patents (Class G9B/5.231)

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[n: where the spacing is maintained by using interaction of forces, e.g. attraction-repulsion (interaction in a magnetic field, see g9b/5.206)] {g11b 5/60d1a} (Class G9B/5.232)

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