Question: when was the double edged safety razor invented
[{'answer': '1901', 'provenance': [{'wikipedia_id': '583832', 'title': 'Safety razor', 'start_paragraph_id': 8, 'start_character': 145, 'end_paragraph_id': 8, 'end_character': 149, 'bleu_score': 1.0, 'section': 'Section::::History.:Early designs.\n'}]}, {'provenance': [{'wikipedia_id': '583832', 'title': 'Safety razor', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1030, 'bleu_score': 0.988538208695211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14903741805878522469}, 'section': 'Section::::History.:Early designs.\n'}]}]