{"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":"3602053","name":"R & D Coal Co. Inc."},"operator":{"type":"operator","id":"P23098","name":"R & D Coal Co. Inc."},"controller":{"type":"controller","id":"C14559","name":"David S  Himmelberger"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P05492","name":"Marlin Zimmerman Coal Company"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1950-01-01","validTo":"1986-05-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P05492|1950-01-01|1986-05-04"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C04565","name":"Marlin  Zimmerman"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1950-01-01","validTo":"1986-05-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|C04565|1950-01-01|1986-05-04"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C04565","name":"Marlin  Zimmerman"},"object":{"type":"operator","id":"P05492","name":"Marlin Zimmerman Coal Company"},"validFrom":"1950-01-01","validTo":"1986-05-04","current":false,"derived":true,"evidenceMineId":"3602053","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P05492|1950-01-01|C04565|1950-01-01|66237"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P17696","name":"Buck Mountain Coal Company No 2"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1986-05-05","validTo":"1993-04-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P17696|1986-05-05|1993-04-13"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C12416","name":"David  Zimmerman et al"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1986-05-05","validTo":"1993-04-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|C12416|1986-05-05|1993-04-13"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C12416","name":"David  Zimmerman et al"},"object":{"type":"operator","id":"P17696","name":"Buck Mountain Coal Company No 2"},"validFrom":"1986-05-05","validTo":"1993-04-13","current":false,"derived":true,"evidenceMineId":"3602053","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P17696|1986-05-05|C12416|1986-05-05|86857"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P22617","name":"Buck Mountain Coal Company No 2"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1993-04-14","validTo":"1995-01-12","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P22617|1993-04-14|1995-01-12"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C14977","name":"Oscar  Blough Jr"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1993-04-14","validTo":"1995-01-12","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|C14977|1993-04-14|1995-01-12"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C14977","name":"Oscar  Blough Jr"},"object":{"type":"operator","id":"P22617","name":"Buck Mountain Coal Company No 2"},"validFrom":"1993-04-14","validTo":"1995-01-12","current":false,"derived":true,"evidenceMineId":"3602053","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P22617|1993-04-14|C14977|1993-04-14|94404"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23098","name":"R & D Coal Co. Inc."},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1995-01-13","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P23098|1995-01-13|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C14559","name":"David S  Himmelberger et al"},"object":{"type":"mine","id":"3602053","name":"R & D Coal Co. Inc."},"validFrom":"1995-01-13","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|C14559|1995-01-13|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C14559","name":"David S  Himmelberger et al"},"object":{"type":"operator","id":"P23098","name":"R & D Coal Co. Inc."},"validFrom":"1995-01-13","validTo":null,"current":true,"derived":true,"evidenceMineId":"3602053","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3602053|P23098|1995-01-13|C14559|1995-01-13|93308"}}],"coverage":{"historyRecords":4,"edgeCount":12,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3602053","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"}}