{"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":"2026-10-18T09:31:49.615908+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":"1200942","name":"Will Coal Mine No 1 (Millersburg Pit)"},"operator":{"type":"operator","id":"P05239","name":"Will Construction Company Inc"},"controller":{"type":"controller","id":"C04330","name":"Will Gene C"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P04790","name":"L G Wasson Coal Mining Corp"},"object":{"type":"mine","id":"1200942","name":"Will Coal Mine No 1 (Millersburg Pit)"},"validFrom":"1950-01-01","validTo":"1979-01-17","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1200942|P04790|1950-01-01|1979-01-17"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C03953","name":"Wasson L G"},"object":{"type":"mine","id":"1200942","name":"Will Coal Mine No 1 (Millersburg Pit)"},"validFrom":"1950-01-01","validTo":"1979-01-17","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1200942|C03953|1950-01-01|1979-01-17"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C03953","name":"Wasson L G"},"object":{"type":"operator","id":"P04790","name":"L G Wasson Coal Mining Corp"},"validFrom":"1950-01-01","validTo":"1979-01-17","current":false,"derived":true,"evidenceMineId":"1200942","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1200942|P04790|1950-01-01|C03953|1950-01-01|64319"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C04330","name":"Will Gene C Et Al"},"object":{"type":"mine","id":"1200942","name":"Will Coal Mine No 1 (Millersburg Pit)"},"validFrom":"1975-08-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1200942|C04330|1975-08-12|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P05239","name":"Will Construction Company Inc"},"object":{"type":"mine","id":"1200942","name":"Will Coal Mine No 1 (Millersburg Pit)"},"validFrom":"1979-01-18","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1200942|P05239|1979-01-18|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C04330","name":"Will Gene C Et Al"},"object":{"type":"operator","id":"P05239","name":"Will Construction Company Inc"},"validFrom":"1979-01-18","validTo":null,"current":true,"derived":true,"evidenceMineId":"1200942","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1200942|P05239|1979-01-18|C04330|1975-08-12|65408"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1200942","dataSource":"postgres","snapshotId":"2026-10-18T09:31:49.615908+00:00","completedAt":"2026-10-18T09:31:49.615Z","sourceCount":20,"totalRows":17915666,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}