Question: when was the first electric breast pump invented
[{'answer': '1921 - 23', 'provenance': [{'wikipedia_id': '261645', 'title': 'Breast pump', 'start_paragraph_id': 3, 'start_character': 217, 'end_paragraph_id': 3, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '261645', 'title': 'Breast pump', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 914, 'bleu_score': 0.9567216592937481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11570914129246707778}, 'section': 'Section::::History.\n'}]}]