{"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":"2026-10-18T09:31:49.615908+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":"3303321","name":"Mechanicsburg Sand & Gravel Inc"},"operator":{"type":"operator","id":"L36128","name":"Mechanicsburg Sand & Gravel Inc"},"controller":{"type":"controller","id":"0194161","name":"Charles R  Wibright"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L36128","name":"Mechanicsburg Sand & Gravel Inc"},"object":{"type":"mine","id":"3303321","name":"Mechanicsburg Sand & Gravel Inc"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3303321|L36128|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M36128","name":"James G  Cushman"},"object":{"type":"mine","id":"3303321","name":"Mechanicsburg Sand & Gravel Inc"},"validFrom":"1950-01-01","validTo":"2025-06-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3303321|M36128|1950-01-01|2025-06-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M36128","name":"James G  Cushman"},"object":{"type":"operator","id":"L36128","name":"Mechanicsburg Sand & Gravel Inc"},"validFrom":"1950-01-01","validTo":"2025-06-29","current":false,"derived":true,"evidenceMineId":"3303321","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3303321|L36128|1950-01-01|M36128|1950-01-01|165160"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0194161","name":"Charles R  Wibright"},"object":{"type":"mine","id":"3303321","name":"Mechanicsburg Sand & Gravel Inc"},"validFrom":"2025-06-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3303321|0194161|2025-06-30|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0194161","name":"Charles R  Wibright"},"object":{"type":"operator","id":"L36128","name":"Mechanicsburg Sand & Gravel Inc"},"validFrom":"2025-06-30","validTo":null,"current":true,"derived":true,"evidenceMineId":"3303321","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3303321|L36128|1950-01-01|0194161|2025-06-30|41508"}}],"coverage":{"historyRecords":2,"edgeCount":5,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3303321","dataSource":"postgres","snapshotId":"2026-10-18T09:31:49.615908+00:00","completedAt":"2026-10-18T09:31:49.615Z","sourceCount":20,"totalRows":17915666,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}