Question: when did singer start making electric sewing machines
[{'answer': '1889', 'provenance': [{'wikipedia_id': '38477', 'title': 'Singer Corporation', 'start_paragraph_id': 5, 'start_character': 550, 'end_paragraph_id': 5, 'end_character': 554, 'bleu_score': 1.0, 'section': "Section::::History of Singer's sewing machines and its business.\n"}]}, {'provenance': [{'wikipedia_id': '38477', 'title': 'Singer Corporation', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 721, 'bleu_score': 0.9822204502117851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9526559718553841839}, 'section': "Section::::History of Singer's sewing machines and its business.\n"}]}]