{"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":"1101618","name":"Prosser Construction Co."},"operator":{"type":"operator","id":"L15384","name":"Prosser Construction Company"},"controller":{"type":"controller","id":"M11587","name":"Holley  Bailey; Charles  Adams"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L04942","name":"Hanfland Sand & Gravel Company"},"object":{"type":"mine","id":"1101618","name":"Prosser Construction Co."},"validFrom":"1950-01-01","validTo":"1981-02-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L04942|1950-01-01|1981-02-28"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03988","name":"Maurice  Weishaar"},"object":{"type":"mine","id":"1101618","name":"Prosser Construction Co."},"validFrom":"1950-01-01","validTo":"1981-02-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|M03988|1950-01-01|1981-02-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03988","name":"Maurice  Weishaar"},"object":{"type":"operator","id":"L04942","name":"Hanfland Sand & Gravel Company"},"validFrom":"1950-01-01","validTo":"1981-02-28","current":false,"derived":true,"evidenceMineId":"1101618","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L04942|1950-01-01|M03988|1950-01-01|130658"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L04943","name":"G W Prosser Company"},"object":{"type":"mine","id":"1101618","name":"Prosser Construction Co."},"validFrom":"1981-03-01","validTo":"1997-06-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L04943|1981-03-01|1997-06-15"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03989","name":"James H  Prosser"},"object":{"type":"mine","id":"1101618","name":"Prosser Construction Co."},"validFrom":"1981-03-01","validTo":"1997-06-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|M03989|1981-03-01|1997-06-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03989","name":"James H  Prosser"},"object":{"type":"operator","id":"L04943","name":"G W Prosser Company"},"validFrom":"1981-03-01","validTo":"1997-06-15","current":false,"derived":true,"evidenceMineId":"1101618","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L04943|1981-03-01|M03989|1981-03-01|130659"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L15384","name":"Prosser Construction Company"},"object":{"type":"mine","id":"1101618","name":"Prosser Construction Co."},"validFrom":"1997-06-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L15384|1997-06-16|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11587","name":"Holley  Bailey et al"},"object":{"type":"mine","id":"1101618","name":"Prosser Construction Co."},"validFrom":"1997-06-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|M11587|1997-06-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11587","name":"Holley  Bailey et al"},"object":{"type":"operator","id":"L15384","name":"Prosser Construction Company"},"validFrom":"1997-06-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"1101618","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L15384|1997-06-16|M11587|1997-06-16|151784"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11587","name":"Charles  Adams et al"},"object":{"type":"operator","id":"L15384","name":"Prosser Construction Company"},"validFrom":"1997-06-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"1101618","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1101618|L15384|1997-06-16|M11587|1997-06-16|151785"}}],"coverage":{"historyRecords":4,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1101618","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"}}