{
  "type": [
    "component"
  ],
  "machine": "constructor",
  "recipes": [
    {
      "input": {
        "limestone": 3
      },
      "output": {
        "concrete": 1
      },
      "crafting_time": 4,
      "clicks": 1,
      "requires": "hub_upgrade_2"
    }
  ]
}