{"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":"2500056","name":"Marion Portable #873"},"operator":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"controller":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00112","name":"Hopper Brothers Quarries"},"object":{"type":"mine","id":"2500056","name":"Marion Portable #873"},"validFrom":"1950-01-01","validTo":"1980-08-07","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2500056|L00112|1950-01-01|1980-08-07"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00093","name":"Hopper Chester & Raymond"},"object":{"type":"mine","id":"2500056","name":"Marion Portable #873"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2500056|M00093|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00093","name":"Hopper Chester & Raymond"},"object":{"type":"operator","id":"L00112","name":"Hopper Brothers Quarries"},"validFrom":"1950-01-01","validTo":"1980-08-07","current":false,"derived":true,"evidenceMineId":"2500056","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2500056|L00112|1950-01-01|M00093|1950-01-01|104049"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"2500056","name":"Marion Portable #873"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2500056|M00174|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"object":{"type":"mine","id":"2500056","name":"Marion Portable #873"},"validFrom":"1980-08-08","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2500056|L00208|1980-08-08|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"validFrom":"1980-08-08","validTo":null,"current":true,"derived":true,"evidenceMineId":"2500056","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2500056|L00208|1980-08-08|M00174|1950-01-01|106075"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2500056","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"}}