"soundproofed" meaning in All languages combined

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  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
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        {
          "ref": "1959 March, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 133:",
          "text": "Over the permanent way of this main line, which is now in first-class condition, the riding of No. D205 was perfectly smooth, and in the sound-proofed cab silent also, and it was a most pleasant experience.",
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        "simple past and past participle of soundproof"
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  "word": "soundproofed"
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  "lang_code": "en",
  "pos": "verb",
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        {
          "ref": "1959 March, Cecil J. Allen, “Locomotive Running Past and Present”, in Trains Illustrated, page 133:",
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