# Relationship history for MSHA mine 4201660

Current hierarchy: **British Petroleum Company PLC → Kennecott Utah Copper Corp → Ore Haulage Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kennecott Copper Corp → Ore Haulage Plant; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Minerals Company → Ore Haulage Plant; 1980-03-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Kennecott Copper Corp → Kennecott Minerals Company; 1980-03-01 to 1981-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Utah Copper Corp → Ore Haulage Plant; 1981-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** British Petroleum Company PLC → Ore Haulage Plant; 1981-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Kennecott Utah Copper Corp; 1981-06-04 to current/open; source msha-controller-operator-history