Question: who patented the first commercially successful ballpoint pen
[{'answer': 'Milton Reynolds', 'provenance': [{'wikipedia_id': '4519', 'title': 'Ballpoint pen', 'start_paragraph_id': 15, 'start_character': 46, 'end_paragraph_id': 15, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::History.:Postwar proliferation.\n'}]}, {'provenance': [{'wikipedia_id': '4519', 'title': 'Ballpoint pen', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 948, 'bleu_score': 0.946790728189649, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6676918852099569559}, 'section': 'Section::::History.:Postwar proliferation.\n'}]}]