{"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":"1507455","name":"No 27 Mine"},"operator":{"type":"operator","id":"P02681","name":"B & S Coal Company"},"controller":{"type":"controller","id":"C02311","name":"Smith Lonnie & Eli"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P02680","name":"K & S Coal Company"},"object":{"type":"mine","id":"1507455","name":"No 27 Mine"},"validFrom":"1974-01-01","validTo":"1975-03-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507455|P02680|1974-01-01|1975-03-16"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02310","name":"K & S Coal Co"},"object":{"type":"mine","id":"1507455","name":"No 27 Mine"},"validFrom":"1974-01-01","validTo":"1975-03-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507455|C02310|1974-01-01|1975-03-16"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02310","name":"K & S Coal Co"},"object":{"type":"operator","id":"P02680","name":"K & S Coal Company"},"validFrom":"1974-01-01","validTo":"1975-03-16","current":false,"derived":true,"evidenceMineId":"1507455","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507455|P02680|1974-01-01|C02310|1974-01-01|58107"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P02681","name":"B & S Coal Company"},"object":{"type":"mine","id":"1507455","name":"No 27 Mine"},"validFrom":"1975-03-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507455|P02681|1975-03-17|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02311","name":"Smith Lonnie & Eli"},"object":{"type":"mine","id":"1507455","name":"No 27 Mine"},"validFrom":"1975-03-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507455|C02311|1975-03-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02311","name":"Smith Lonnie & Eli"},"object":{"type":"operator","id":"P02681","name":"B & S Coal Company"},"validFrom":"1975-03-17","validTo":null,"current":true,"derived":true,"evidenceMineId":"1507455","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507455|P02681|1975-03-17|C02311|1975-03-17|58108"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1507455","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"}}