{"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":"2026-10-17T05:35:58.500035+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":"1400506","name":"KAW Sand Plant"},"operator":{"type":"operator","id":"L01472","name":"Midwest Concrete Materials, Inc."},"controller":{"type":"controller","id":"0194821","name":"Christopher J  Eichman"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01317","name":"Robert H  Eichman"},"object":{"type":"mine","id":"1400506","name":"KAW Sand Plant"},"validFrom":"1950-01-01","validTo":"2025-01-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|M01317|1950-01-01|2025-01-31"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01779","name":"Kewshaw Ready-Mix Concrete & Sand Co Inc"},"object":{"type":"mine","id":"1400506","name":"KAW Sand Plant"},"validFrom":"1950-01-01","validTo":"1997-03-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|L01779|1950-01-01|1997-03-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01603","name":"J Daniel  Kershaw"},"object":{"type":"mine","id":"1400506","name":"KAW Sand Plant"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|M01603|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01603","name":"J Daniel  Kershaw"},"object":{"type":"operator","id":"L01779","name":"Kewshaw Ready-Mix Concrete & Sand Co Inc"},"validFrom":"1950-01-01","validTo":"1997-03-31","current":false,"derived":true,"evidenceMineId":"1400506","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|L01779|1950-01-01|M01603|1950-01-01|119601"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01472","name":"Midwest Concrete Materials, Inc."},"object":{"type":"mine","id":"1400506","name":"KAW Sand Plant"},"validFrom":"1997-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|L01472|1997-04-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01317","name":"Robert H  Eichman"},"object":{"type":"operator","id":"L01472","name":"Midwest Concrete Materials, Inc."},"validFrom":"1997-04-01","validTo":"2025-01-31","current":false,"derived":true,"evidenceMineId":"1400506","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|L01472|1997-04-01|M01317|1950-01-01|117966"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0194821","name":"Christopher J  Eichman"},"object":{"type":"mine","id":"1400506","name":"KAW Sand Plant"},"validFrom":"2025-02-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|0194821|2025-02-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0194821","name":"Christopher J  Eichman"},"object":{"type":"operator","id":"L01472","name":"Midwest Concrete Materials, Inc."},"validFrom":"2025-02-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1400506","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1400506|L01472|1997-04-01|0194821|2025-02-01|41631"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1400506","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}