{"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":"2102971","name":"Crusher #2 Cedar Rapids"},"operator":{"type":"operator","id":"L36501","name":"Morris Sand & Gravel,Inc."},"controller":{"type":"controller","id":"M36501","name":"Michael C  Brandt"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07710","name":"Henry B  Thieman"},"object":{"type":"mine","id":"2102971","name":"Crusher #2 Cedar Rapids"},"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":"2102971|M07710|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L09831","name":"West Central Gravel Inc."},"object":{"type":"mine","id":"2102971","name":"Crusher #2 Cedar Rapids"},"validFrom":"1987-09-01","validTo":"2014-01-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2102971|L09831|1987-09-01|2014-01-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07710","name":"Henry B  Thieman"},"object":{"type":"operator","id":"L09831","name":"West Central Gravel Inc."},"validFrom":"1987-09-01","validTo":"2014-01-15","current":false,"derived":true,"evidenceMineId":"2102971","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2102971|L09831|1987-09-01|M07710|1950-01-01|141799"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M36501","name":"Michael C  Brandt"},"object":{"type":"mine","id":"2102971","name":"Crusher #2 Cedar Rapids"},"validFrom":"1992-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2102971|M36501|1992-06-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L36501","name":"Morris Sand & Gravel,Inc."},"object":{"type":"mine","id":"2102971","name":"Crusher #2 Cedar Rapids"},"validFrom":"2014-01-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2102971|L36501|2014-01-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M36501","name":"Michael C  Brandt"},"object":{"type":"operator","id":"L36501","name":"Morris Sand & Gravel,Inc."},"validFrom":"2014-01-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"2102971","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2102971|L36501|2014-01-16|M36501|1992-06-01|165612"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2102971","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"}}