{"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":"2026-10-17T05:35:58.500035+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":"2301095","name":"Howard County Coal Company Mine #1"},"operator":{"type":"operator","id":"P07571","name":"Howard County Coal Company"},"controller":{"type":"controller","id":"C05803","name":"Alexander Robert F"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P04200","name":"H & H Supply Company"},"object":{"type":"mine","id":"2301095","name":"Howard County Coal Company Mine #1"},"validFrom":"1950-01-01","validTo":"1978-02-17","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2301095|P04200|1950-01-01|1978-02-17"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C03455","name":"Hargis Lowell"},"object":{"type":"mine","id":"2301095","name":"Howard County Coal Company Mine #1"},"validFrom":"1950-01-01","validTo":"1978-02-17","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2301095|C03455|1950-01-01|1978-02-17"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C03455","name":"Hargis Lowell"},"object":{"type":"operator","id":"P04200","name":"H & H Supply Company"},"validFrom":"1950-01-01","validTo":"1978-02-17","current":false,"derived":true,"evidenceMineId":"2301095","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2301095|P04200|1950-01-01|C03455|1950-01-01|62987"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P07571","name":"Howard County Coal Company"},"object":{"type":"mine","id":"2301095","name":"Howard County Coal Company Mine #1"},"validFrom":"1978-02-18","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2301095|P07571|1978-02-18|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C05803","name":"Alexander Robert F"},"object":{"type":"mine","id":"2301095","name":"Howard County Coal Company Mine #1"},"validFrom":"1978-02-18","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2301095|C05803|1978-02-18|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C05803","name":"Alexander Robert F"},"object":{"type":"operator","id":"P07571","name":"Howard County Coal Company"},"validFrom":"1978-02-18","validTo":null,"current":true,"derived":true,"evidenceMineId":"2301095","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2301095|P07571|1978-02-18|C05803|1978-02-18|69921"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2301095","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}