Detail the history and impact of the telephone switchboard, including its invention, evolution, and the role of operators in shaping communication infrastructure. Present this information as a JSON object.
{
  "invention": {
    "year": 1877,
    "inventor": "Elisha Gray",
    "company": "Western Electric Company"
  },
  "evolution": [
    {
      "year": 1878,
      "event": "First telephone exchange opens in New Haven, Connecticut."
    },
    {
      "year": 1882,
      "event": "Thomas Edison invents the first automatic switchboard using electromechanical relays."
    },
    {
      "year": 1919,
      "event": "The first dial telephones are introduced, reducing the need for operators to manually connect calls."
    },
    {
      "year": 1927,
      "event": "Transatlantic telephone service is established between the United States and Europe."
    },
    {
      "year": 1960,
      "event": "Electronic switching systems replace electromechanical systems, automating many operator tasks."
    },
    {
      "year": 1980s,
      "event": "Digital technology replaces analog systems, further automating call routing and management."
    }
  ],
  "impact": [
    {
      "area": "employment",
      "description": "Telephone switchboards created thousands of jobs for operators, especially women, who were responsible for connecting calls and providing assistance to callers."
    },
    {
      "area": "communication",
      "description": "Switchboards enabled long-distance communication, allowing people to stay connected with friends, family, and businesses across great distances."
    },
    {
      "area": "technology",
      "description": "The invention and evolution of the telephone switchboard led to advancements in telecommunications technology, including automated systems, digital networks, and the internet."
    },
    {
      "area": "society",
      "description": "The telephone switchboard revolutionized communication, making it faster and more efficient, and played a significant role in shaping modern society."
    }
  ],
  "role_of_operators": [
    {
      "task": "connecting_calls",
      "description": "Operators manually connected calls by plugging cords into the appropriate jacks on the switchboard."
    },
    {
      "task": "providing_assistance",
      "description": "Operators provided assistance to callers, such as helping them find phone numbers or connecting them to emergency services."
    },
    {
      "task": "monitoring_quality",
      "description": "Operators monitored call quality and ensured that connections were clear and stable."
    },
    {
      "task": "managing_traffic",
      "description": "Operators managed call traffic during peak times, prioritizing important calls and managing limited resources."
    }
  ]
}