# Relationship history for MSHA mine 1511358

Current hierarchy: **B W  McDonald → Minquest Inc → No 1**

- 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:** Occidental Petroleum Corp → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Island Creek Coal Company → No 1; 1978-05-01 to 1981-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Occidental Petroleum Corp → Island Creek Coal Company; 1978-05-01 to 1981-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Enoxy Coal Inc → No 1; 1982-01-01 to 1985-07-31; source msha-controller-operator-history
- **controller_controls_mine:** ENI → No 1; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ENI → Enoxy Coal Inc; 1982-01-01 to 1985-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Minquest Inc → No 1; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B W  McDonald → No 1; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Minquest Inc; 1985-08-01 to current/open; source msha-controller-operator-history