Question: when did hand held hair dryers come out
[{'answer': '1920', 'provenance': [{'wikipedia_id': '986413', 'title': 'Hair dryer', 'start_paragraph_id': 4, 'start_character': 55, 'end_paragraph_id': 4, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]