{
  "title": "Carbon and graphite product data for AI grade and dimension records",
  "source_page": "https://fiund.com/industries/carbon-brush-grade-dimension-data",
  "authorship": "Original fictional Fiund editorial exercise. No actual operating records or third-party source assets are included.",
  "example": {
    "title": "Geometry match leaves grade identity open",
    "context": "The contributor uses paper brush silhouettes and fictional grade labels. The dimensions are arbitrary.",
    "records": [
      [
        "1",
        "Order card",
        "Part C7, grade G2, width 6 mm."
      ],
      [
        "2",
        "Inspection",
        "Sample C7 width 6 mm; grade stamp unreadable."
      ],
      [
        "3",
        "Catalog note",
        "G1 and G2 share the same geometry."
      ]
    ],
    "question": "Can the observed sample be identified as grade G2?",
    "answer": "No. Record 2 supports the part marking and width in record 1, but the grade stamp is unreadable. Record 3 rules out identifying G2 from geometry alone. Store a documented width match and unresolved grade rather than marking the entire sample a match.",
    "failureModes": [
      "Inferring material grade from shape",
      "Treating an unreadable stamp as a negative G2 observation"
    ],
    "fields": [
      [
        "grade_mark_visibility",
        "Gates positive grade identity"
      ],
      [
        "measured_width",
        "Records dimensional evidence"
      ],
      [
        "geometry_family",
        "Shows when distinct grades look alike"
      ]
    ],
    "holdout": "Include a readable G1 stamp and require distinguishing a definite grade mismatch from missing evidence.",
    "boundary": "No real brush materials, machine selection advice, electrical specifications or tolerances."
  }
}