Question: when was the first hand held camera invented
[{'answer': 'Kazimierz Prószyński', 'provenance': [{'wikipedia_id': '199539', 'title': 'Movie camera', 'start_paragraph_id': 9, 'start_character': 29, 'end_paragraph_id': 9, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '199539', 'title': 'Movie camera', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 496, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18417087699642461722}, 'section': 'Section::::History.:Mass-market.\n'}]}]