{"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":"3901379","name":"UNIT NO. 1- Power Screen Portable"},"operator":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"controller":{"type":"controller","id":"0171480","name":"Nathan  Dawson; Dianne  Dawson"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"object":{"type":"mine","id":"3901379","name":"UNIT NO. 1- Power Screen Portable"},"validFrom":"1990-05-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M32472","name":"Randy  Dawson et al"},"object":{"type":"mine","id":"3901379","name":"UNIT NO. 1- Power Screen Portable"},"validFrom":"1990-05-01","validTo":"2019-01-14","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|M32472|1990-05-01|2019-01-14"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M32472","name":"Randy  Dawson et al"},"object":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"validFrom":"1990-05-01","validTo":"2019-01-14","current":false,"derived":true,"evidenceMineId":"3901379","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|M32472|1990-05-01|160925"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M32472","name":"Daniel  Dawson et al"},"object":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"validFrom":"1990-05-01","validTo":"2019-01-14","current":false,"derived":true,"evidenceMineId":"3901379","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|M32472|1990-05-01|160926"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0151281","name":"Nathan  Dawson et al"},"object":{"type":"mine","id":"3901379","name":"UNIT NO. 1- Power Screen Portable"},"validFrom":"2019-01-15","validTo":"2020-09-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|0151281|2019-01-15|2020-09-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0151281","name":"Nathan  Dawson et al"},"object":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"validFrom":"2019-01-15","validTo":"2020-09-28","current":false,"derived":true,"evidenceMineId":"3901379","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|0151281|2019-01-15|31248"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0151281","name":"Daniel  Dawson et al"},"object":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"validFrom":"2019-01-15","validTo":"2020-09-28","current":false,"derived":true,"evidenceMineId":"3901379","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|0151281|2019-01-15|31249"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0171480","name":"Nathan  Dawson et al"},"object":{"type":"mine","id":"3901379","name":"UNIT NO. 1- Power Screen Portable"},"validFrom":"2020-09-29","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|0171480|2020-09-29|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0171480","name":"Nathan  Dawson et al"},"object":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"validFrom":"2020-09-29","validTo":null,"current":true,"derived":true,"evidenceMineId":"3901379","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|0171480|2020-09-29|36320"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0171480","name":"Dianne  Dawson et al"},"object":{"type":"operator","id":"L32472","name":"Dawson Construction Inc"},"validFrom":"2020-09-29","validTo":null,"current":true,"derived":true,"evidenceMineId":"3901379","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3901379|L32472|1990-05-01|0171480|2020-09-29|36321"}}],"coverage":{"historyRecords":6,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3901379","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"}}