[n: Pulse Code Modulation Systems For Audio Signals (g9b/20.047 Takes Precedence)] {g11b 20/18b} Patents (Class G9B/20.048)

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[n: by interleaving] {g11b 20/18b1} (Class G9B/20.049)
[n: by adding special bits or symbols to the coded information (g9b/20.049 takes precedence)] {g11b 20/18b2} (Class G9B/20.05)

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