{"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":"1508270","name":"No 1 Surface"},"operator":{"type":"operator","id":"P05327","name":"B B & T Minerals"},"controller":{"type":"controller","id":"C04410","name":"Townley Lynn"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02007","name":"Williams & Crabtree Construction Company Inc"},"object":{"type":"mine","id":"1508270","name":"No 1 Surface"},"validFrom":"1975-03-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1508270|C02007|1975-03-05|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P02345","name":"Williams & Crabtree Construction Company Inc"},"object":{"type":"mine","id":"1508270","name":"No 1 Surface"},"validFrom":"1975-04-21","validTo":"1977-04-18","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1508270|P02345|1975-04-21|1977-04-18"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02007","name":"Williams & Crabtree Construction Company Inc"},"object":{"type":"operator","id":"P02345","name":"Williams & Crabtree Construction Company Inc"},"validFrom":"1975-04-21","validTo":"1977-04-18","current":false,"derived":true,"evidenceMineId":"1508270","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1508270|P02345|1975-04-21|C02007|1975-03-05|57150"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C04410","name":"Townley Lynn"},"object":{"type":"mine","id":"1508270","name":"No 1 Surface"},"validFrom":"1976-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1508270|C04410|1976-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P05327","name":"B B & T Minerals"},"object":{"type":"mine","id":"1508270","name":"No 1 Surface"},"validFrom":"1977-04-19","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1508270|P05327|1977-04-19|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C04410","name":"Townley Lynn"},"object":{"type":"operator","id":"P05327","name":"B B & T Minerals"},"validFrom":"1977-04-19","validTo":null,"current":true,"derived":true,"evidenceMineId":"1508270","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1508270|P05327|1977-04-19|C04410|1976-01-01|65932"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1508270","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"}}