{"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":"4300106","name":"Coventry Plant 156"},"operator":{"type":"operator","id":"L00435","name":"Peckham Materials Corp"},"controller":{"type":"controller","id":"M00356","name":"Peckham Industries Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L04759","name":"Calkins Sand & Gravel Inc"},"object":{"type":"mine","id":"4300106","name":"Coventry Plant 156"},"validFrom":"1950-01-01","validTo":"2025-08-27","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|L04759|1950-01-01|2025-08-27"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00356","name":"Peckham Industries Inc"},"object":{"type":"mine","id":"4300106","name":"Coventry Plant 156"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|M00356|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03846","name":"Rita M  Calkins"},"object":{"type":"mine","id":"4300106","name":"Coventry Plant 156"},"validFrom":"1950-01-01","validTo":"2020-01-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|M03846|1950-01-01|2020-01-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03846","name":"Rita M  Calkins"},"object":{"type":"operator","id":"L04759","name":"Calkins Sand & Gravel Inc"},"validFrom":"1950-01-01","validTo":"2020-01-28","current":false,"derived":true,"evidenceMineId":"4300106","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|L04759|1950-01-01|M03846|1950-01-01|130235"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0155761","name":"Rita M Calkins Trust"},"object":{"type":"mine","id":"4300106","name":"Coventry Plant 156"},"validFrom":"2020-01-29","validTo":"2024-04-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|0155761|2020-01-29|2024-04-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0155761","name":"Rita M Calkins Trust"},"object":{"type":"operator","id":"L04759","name":"Calkins Sand & Gravel Inc"},"validFrom":"2020-01-29","validTo":"2024-04-09","current":false,"derived":true,"evidenceMineId":"4300106","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|L04759|1950-01-01|0155761|2020-01-29|32291"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0184020","name":"Karen K Martel Revocable Trust"},"object":{"type":"mine","id":"4300106","name":"Coventry Plant 156"},"validFrom":"2024-04-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|0184020|2024-04-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0184020","name":"Karen K Martel Revocable Trust"},"object":{"type":"operator","id":"L04759","name":"Calkins Sand & Gravel Inc"},"validFrom":"2024-04-10","validTo":"2025-08-27","current":false,"derived":true,"evidenceMineId":"4300106","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|L04759|1950-01-01|0184020|2024-04-10|39270"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00435","name":"Peckham Materials Corp"},"object":{"type":"mine","id":"4300106","name":"Coventry Plant 156"},"validFrom":"2025-08-28","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|L00435|2025-08-28|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00356","name":"Peckham Industries Inc"},"object":{"type":"operator","id":"L00435","name":"Peckham Materials Corp"},"validFrom":"2025-08-28","validTo":null,"current":true,"derived":true,"evidenceMineId":"4300106","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4300106|L00435|2025-08-28|M00356|1950-01-01|109966"}}],"coverage":{"historyRecords":4,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4300106","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"}}