{"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":"1900311","name":"GEORGETOWN SAND AND GRAVEL CO, INC"},"operator":{"type":"operator","id":"L06464","name":"Georgetown Sand & Gravel Company Inc"},"controller":{"type":"controller","id":"M05142","name":"Timothy A  Pybus"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06463","name":"Georgetown Sand & Gravel Company Inc"},"object":{"type":"mine","id":"1900311","name":"GEORGETOWN SAND AND GRAVEL CO, INC"},"validFrom":"1950-01-01","validTo":"1983-02-21","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1900311|L06463|1950-01-01|1983-02-21"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M05141","name":"Vincent  Gould"},"object":{"type":"mine","id":"1900311","name":"GEORGETOWN SAND AND GRAVEL CO, INC"},"validFrom":"1950-01-01","validTo":"1983-02-21","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1900311|M05141|1950-01-01|1983-02-21"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M05141","name":"Vincent  Gould"},"object":{"type":"operator","id":"L06463","name":"Georgetown Sand & Gravel Company Inc"},"validFrom":"1950-01-01","validTo":"1983-02-21","current":false,"derived":true,"evidenceMineId":"1900311","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1900311|L06463|1950-01-01|M05141|1950-01-01|133837"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06464","name":"Georgetown Sand & Gravel Company Inc"},"object":{"type":"mine","id":"1900311","name":"GEORGETOWN SAND AND GRAVEL CO, INC"},"validFrom":"1983-02-22","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1900311|L06464|1983-02-22|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M05142","name":"Timothy A  Pybus"},"object":{"type":"mine","id":"1900311","name":"GEORGETOWN SAND AND GRAVEL CO, INC"},"validFrom":"1983-02-22","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1900311|M05142|1983-02-22|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M05142","name":"Timothy A  Pybus"},"object":{"type":"operator","id":"L06464","name":"Georgetown Sand & Gravel Company Inc"},"validFrom":"1983-02-22","validTo":null,"current":true,"derived":true,"evidenceMineId":"1900311","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1900311|L06464|1983-02-22|M05142|1983-02-22|133838"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1900311","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"}}