"chadless punch" meaning in English

{
  "forms": [
    {
      "form": "chadless punches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chadless punch (plural chadless punches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A paper tape punch that does not produce little pieces of paper. Instead, \"the perforations are not completely cut out but the chads are permitted to remain attached to the perforated material (for example, tape)\". (U.S. Patent 2,255,794, filed May 20, 1939)"
      ],
      "id": "en-chadless_punch-en-noun-cI~ie6N7",
      "links": [
        [
          "paper tape",
          "paper tape"
        ],
        [
          "punch",
          "punch"
        ],
        [
          "paper",
          "paper"
        ]
      ],
      "related": [
        {
          "word": "chad"
        }
      ]
    }
  ],
  "word": "chadless punch"
}

{
  "forms": [
    {
      "form": "chadless punches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "chadless punch (plural chadless punches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "chad"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A paper tape punch that does not produce little pieces of paper. Instead, \"the perforations are not completely cut out but the chads are permitted to remain attached to the perforated material (for example, tape)\". (U.S. Patent 2,255,794, filed May 20, 1939)"
      ],
      "links": [
        [
          "paper tape",
          "paper tape"
        ],
        [
          "punch",
          "punch"
        ],
        [
          "paper",
          "paper"
        ]
      ]
    }
  ],
  "word": "chadless punch"
}