Question: when did allis chalmers go out of business
[{'answer': 'In the 1980s and 1990s', 'provenance': [{'wikipedia_id': '1904554', 'title': 'Allis-Chalmers', 'start_paragraph_id': 1, 'start_character': 1015, 'end_paragraph_id': 1, 'end_character': 1037, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1904554', 'title': 'Allis-Chalmers', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1168, 'bleu_score': 0.9884053071617651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13697103156047509047}, 'section': 'Section::::Abstract.'}]}]