Question: when was the first motorized lawn mower invented
[{'answer': '1893', 'provenance': [{'wikipedia_id': '343857', 'title': 'Lawn mower', 'start_paragraph_id': 12, 'start_character': 350, 'end_paragraph_id': 12, 'end_character': 354, 'bleu_score': 1.0, 'section': 'Section::::History.:Further improvements.\n'}]}, {'provenance': [{'wikipedia_id': '343857', 'title': 'Lawn mower', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 701, 'bleu_score': 0.9518100826915871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11691876901482945337}, 'section': 'Section::::History.:Further improvements.\n'}]}]