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  1. Revolutionizing the NFL: A Game-Changing Electronic First Down ...

  2. Are chains on the way out? NFL to test new technology for …

  3. Report: NFL to Test 1st Down Technology in Preseason; Rule …

  4. REPORT: NFL Finally Testing New Innovative System To Replace …

  5. What is a chain gang in the NFL? How new preseason optical …

  6. NFL Finally Working to Eliminate Outdated Way of Measuring First Downs

  7. NFL mulls a high-tech approach to first-down measurements

  8. NFL Testing System to Electronically Measure 1st Downs, Replace …

  9. NFL testing high-tech optical tracking to measure first downs

  10. NFL Testing Electronic First Downs To Replace Chains