{"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":"3502548","name":"Swisshome Rock Quarry"},"operator":{"type":"operator","id":"L11588","name":"Lloyd S Hockema Inc"},"controller":{"type":"controller","id":"M08953","name":"Lloyd S  Hockema"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03310","name":"Hardrock Quarry Inc"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1950-01-01","validTo":"1985-02-03","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L03310|1950-01-01|1985-02-03"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02656","name":"Arthur V  Miville Jr"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|M02656|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02656","name":"Arthur V  Miville Jr"},"object":{"type":"operator","id":"L03310","name":"Hardrock Quarry Inc"},"validFrom":"1950-01-01","validTo":"1985-02-03","current":false,"derived":true,"evidenceMineId":"3502548","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L03310|1950-01-01|M02656|1950-01-01|126492"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L07565","name":"Ferguson Logging Company"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1985-02-04","validTo":"1987-06-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L07565|1985-02-04|1987-06-30"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M06011","name":"R Gary  Ferguson"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1985-02-04","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|M06011|1985-02-04|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M06011","name":"R Gary  Ferguson"},"object":{"type":"operator","id":"L07565","name":"Ferguson Logging Company"},"validFrom":"1985-02-04","validTo":"1987-06-30","current":false,"derived":true,"evidenceMineId":"3502548","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L07565|1985-02-04|M06011|1985-02-04|136002"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L09815","name":"S2-F Corp"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1987-07-01","validTo":"1990-01-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L09815|1987-07-01|1990-01-16"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07697","name":"M O  Salmon Sr"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1987-07-01","validTo":"1994-11-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|M07697|1987-07-01|1994-11-13"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07697","name":"M O  Salmon Sr"},"object":{"type":"operator","id":"L09815","name":"S2-F Corp"},"validFrom":"1987-07-01","validTo":"1990-01-16","current":false,"derived":true,"evidenceMineId":"3502548","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L09815|1987-07-01|M07697|1987-07-01|141812"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L11588","name":"Lloyd S Hockema Inc"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1990-01-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L11588|1990-01-17|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M08953","name":"Lloyd S  Hockema"},"object":{"type":"mine","id":"3502548","name":"Swisshome Rock Quarry"},"validFrom":"1990-01-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|M08953|1990-01-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M08953","name":"Lloyd S  Hockema"},"object":{"type":"operator","id":"L11588","name":"Lloyd S Hockema Inc"},"validFrom":"1990-01-17","validTo":null,"current":true,"derived":true,"evidenceMineId":"3502548","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"3502548|L11588|1990-01-17|M08953|1990-01-17|144756"}}],"coverage":{"historyRecords":4,"edgeCount":12,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3502548","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"}}