{"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":"4604350","name":"Mine No 1"},"operator":{"type":"operator","id":"P15046","name":"Preece Bros Coal Company Inc"},"controller":{"type":"controller","id":"C00953","name":"Preece Homer & George"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P10385","name":"Sandra Coal Corp"},"object":{"type":"mine","id":"4604350","name":"Mine No 1"},"validFrom":"1974-10-01","validTo":"1980-01-03","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|P10385|1974-10-01|1980-01-03"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C07919","name":"Hammond Henry T"},"object":{"type":"mine","id":"4604350","name":"Mine No 1"},"validFrom":"1974-10-01","validTo":"1980-01-03","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|C07919|1974-10-01|1980-01-03"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C07919","name":"Hammond Henry T"},"object":{"type":"operator","id":"P10385","name":"Sandra Coal Corp"},"validFrom":"1974-10-01","validTo":"1980-01-03","current":false,"derived":true,"evidenceMineId":"4604350","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|P10385|1974-10-01|C07919|1974-10-01|75991"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P10386","name":"Four-H Coal Company Inc"},"object":{"type":"mine","id":"4604350","name":"Mine No 1"},"validFrom":"1980-01-04","validTo":"1983-12-08","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|P10386|1980-01-04|1983-12-08"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C03757","name":"Helton Dewey"},"object":{"type":"mine","id":"4604350","name":"Mine No 1"},"validFrom":"1980-01-04","validTo":"1983-12-08","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|C03757|1980-01-04|1983-12-08"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C03757","name":"Helton Dewey"},"object":{"type":"operator","id":"P10386","name":"Four-H Coal Company Inc"},"validFrom":"1980-01-04","validTo":"1983-12-08","current":false,"derived":true,"evidenceMineId":"4604350","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|P10386|1980-01-04|C03757|1980-01-04|63761"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P15046","name":"Preece Bros Coal Company Inc"},"object":{"type":"mine","id":"4604350","name":"Mine No 1"},"validFrom":"1983-12-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|P15046|1983-12-09|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00953","name":"Preece Homer & George"},"object":{"type":"mine","id":"4604350","name":"Mine No 1"},"validFrom":"1983-12-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|C00953|1983-12-09|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00953","name":"Preece Homer & George"},"object":{"type":"operator","id":"P15046","name":"Preece Bros Coal Company Inc"},"validFrom":"1983-12-09","validTo":null,"current":true,"derived":true,"evidenceMineId":"4604350","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4604350|P15046|1983-12-09|C00953|1983-12-09|51252"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4604350","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"}}