# Relationship history for MSHA mine 4201349

Current hierarchy: **Hansen Spenst → Centurion Mines Corp → NORTH TINTIC PROJECT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Kennecott Minerals Company → NORTH TINTIC PROJECT; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Kennecott Copper Corp → NORTH TINTIC PROJECT; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Kennecott Copper Corp → Kennecott Minerals Company; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_mine:** British Petroleum Company PLC → NORTH TINTIC PROJECT; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kennecott Minerals Company → NORTH TINTIC PROJECT; 1981-06-04 to 1994-12-13; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Kennecott Minerals Company; 1981-06-04 to 1994-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Centurion Mines Corp → NORTH TINTIC PROJECT; 1994-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hansen Spenst → NORTH TINTIC PROJECT; 1994-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hansen Spenst → Centurion Mines Corp; 1994-12-14 to current/open; source msha-controller-operator-history