{"data":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-13T11:19:05.459773+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"1517784","name":"No 7"},"operator":{"type":"operator","id":"0050002","name":"AEP Kentucky Coal, L. L. C."},"controller":{"type":"controller","id":"C00329","name":"American Electric Power Company Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C13978","name":"Eddie  Holbrooks"},"object":{"type":"mine","id":"1517784","name":"No 7"},"validFrom":"1989-08-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|C13978|1989-08-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P20531","name":"Husky Coal Company Inc"},"object":{"type":"mine","id":"1517784","name":"No 7"},"validFrom":"1996-05-01","validTo":"2000-10-18","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|P20531|1996-05-01|2000-10-18"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C13978","name":"Eddie  Holbrooks"},"object":{"type":"operator","id":"P20531","name":"Husky Coal Company Inc"},"validFrom":"1996-05-01","validTo":"2000-10-18","current":false,"derived":true,"evidenceMineId":"1517784","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|P20531|1996-05-01|C13978|1989-08-01|91615"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01543","name":"Donn A  Chickering"},"object":{"type":"mine","id":"1517784","name":"No 7"},"validFrom":"1997-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|C01543|1997-07-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23765","name":"Branham & Baker Underground Corp"},"object":{"type":"mine","id":"1517784","name":"No 7"},"validFrom":"2000-10-19","validTo":"2001-10-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|P23765|2000-10-19|2001-10-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01543","name":"Donn A  Chickering"},"object":{"type":"operator","id":"P23765","name":"Branham & Baker Underground Corp"},"validFrom":"2000-10-19","validTo":"2001-10-29","current":false,"derived":true,"evidenceMineId":"1517784","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|P23765|2000-10-19|C01543|1997-07-01|54680"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0050002","name":"AEP Kentucky Coal, L. L. C."},"object":{"type":"mine","id":"1517784","name":"No 7"},"validFrom":"2001-10-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|0050002|2001-10-30|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00329","name":"American Electric Power Company Inc"},"object":{"type":"mine","id":"1517784","name":"No 7"},"validFrom":"2001-10-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|C00329|2001-10-30|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00329","name":"American Electric Power Company Inc"},"object":{"type":"operator","id":"0050002","name":"AEP Kentucky Coal, L. L. C."},"validFrom":"2001-10-30","validTo":null,"current":true,"derived":true,"evidenceMineId":"1517784","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517784|0050002|2001-10-30|C00329|2001-10-30|46173"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1517784","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}