{"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":"5400050","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"operator":{"type":"operator","id":"L06419","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"controller":{"type":"controller","id":"M05107","name":"M C O Industries Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03900","name":"Puerto Rico Concrete Products Inc"},"object":{"type":"mine","id":"5400050","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"validFrom":"1950-01-01","validTo":"1983-01-11","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5400050|L03900|1950-01-01|1983-01-11"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03123","name":"Arturo  Pico Jr"},"object":{"type":"mine","id":"5400050","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"validFrom":"1950-01-01","validTo":"1996-03-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5400050|M03123|1950-01-01|1996-03-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03123","name":"Arturo  Pico Jr"},"object":{"type":"operator","id":"L03900","name":"Puerto Rico Concrete Products Inc"},"validFrom":"1950-01-01","validTo":"1983-01-11","current":false,"derived":true,"evidenceMineId":"5400050","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5400050|L03900|1950-01-01|M03123|1950-01-01|127993"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06419","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"object":{"type":"mine","id":"5400050","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"validFrom":"1983-01-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5400050|L06419|1983-01-12|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M05107","name":"M C O Industries Inc"},"object":{"type":"mine","id":"5400050","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"validFrom":"1983-01-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5400050|M05107|1983-01-12|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M05107","name":"M C O Industries Inc"},"object":{"type":"operator","id":"L06419","name":"SAN LORENZO SAND & GRAVEL COMPANY"},"validFrom":"1983-01-12","validTo":null,"current":true,"derived":true,"evidenceMineId":"5400050","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5400050|L06419|1983-01-12|M05107|1983-01-12|133770"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"5400050","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"}}