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    "abstract": "This paper describes a small sized sound recording adapter designed to fit a standard Mitchell moving picture camera. The need for apparatus which is fairly light and portable has been felt for some time. Devices have already been designed which record sound on the same negative as the picture arid these have proven a valuable supplement to recording apparatus using a separate film. This is especially true in portable work where small space is available and where quick setups have to be made.",
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      "updated": "2026-05-22T20:40:11.684Z",
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    "authors": [
      "C. R. Hanna"
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
      "source": "parsed",
      "updated": "2026-05-22T20:40:11.684Z",
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    "copyright": {
      "holder": "Society of Motion Picture and Television Engineers, Inc.",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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        "updated": "2026-05-22T20:40:11.684Z",
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      "year": "1929",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
        "source": "parsed",
        "updated": "2026-05-22T20:40:11.684Z",
        "version": "smpte-journal-article-nlm@v1"
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
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      "note": "Derived from DOI 10.5594/J13102",
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      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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    "docLabel": "Transactions of the Society of Motion Picture Engineers ( Volume: 13, Issue: 38, May 1929)",
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    "docTitle": "The Mitchell Recording Camera Equipped Interchangeably for Variable Area and Variable Density Sound Recording",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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    "doi": "10.5594/J13102",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
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    "href": "https://doi.org/10.5594/J13102",
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      "confidence": "high",
      "note": "Constructed from DOI 10.5594/J13102",
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      "updated": "2026-05-22T20:40:11.684Z",
      "version": "smpte-journal-article-nlm@v1"
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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        "updated": "2026-05-22T20:40:11.684Z",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
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    "journalAcronym": "MIJR",
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      "confidence": "high",
      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08202015 BACKFILE JOURNAL FRESH/smptej_13_38/MIJR15Vol13No38.xml)",
      "source": "parsed",
      "updated": "2026-06-16T18:14:32.753Z",
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    "number": "38",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
      "source": "parsed",
      "updated": "2026-05-22T20:40:11.684Z",
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    "pages": "312–317",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
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        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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        "updated": "2026-05-22T20:40:11.684Z",
        "version": "smpte-journal-article-nlm@v1"
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      "country": "USA",
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        "confidence": "high",
        "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08202015 BACKFILE JOURNAL FRESH/smptej_13_38/MIJR15Vol13No38.xml)",
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        "updated": "2026-06-16T18:14:32.753Z",
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      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J13102.xml)",
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      "updated": "2026-05-22T20:40:11.684Z",
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    "volume": "13",
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