{
    "departments": [
      {
        "id": "D1",
        "name": "Production",
        "machines": [
          {
            "id": "M1",
            "name": "Lathe Machine",
            "maintenance": [
              {
                "date": "2025-03-15",
                "description": "Replaced worn-out spindle bearings"
              },
              {
                "date": "2025-06-01",
                "description": "Lubricated gear system and checked alignment"
              }
            ]
          },
          { "id": "M2", "name": "Milling Machine" },
          { "id": "M3", "name": "Drill Press" },
          { "id": "M4", "name": "Grinder" }
        ]
      },
      {
        "id": "D2",
        "name": "Assembly",
        "machines": [
          { "id": "M5", "name": "Hydraulic Press" },
          { "id": "M6", "name": "Conveyor Belt" },
          { "id": "M7", "name": "Robotic Arm" },
          { "id": "M8", "name": "Welding Machine" }
        ]
      },
      {
        "id": "D3",
        "name": "Quality Control",
        "machines": [
          { "id": "M9", "name": "CMM Machine" },
          { "id": "M10", "name": "Surface Tester" },
          { "id": "M11", "name": "Tensile Tester" },
          { "id": "M12", "name": "X-ray Scanner" }
        ]
      }
    ]
  }