# Relationship history for MSHA mine 4405675

Current hierarchy: **Mc Cowan Rocky → D & R Coal Company Inc → Mine 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Mc Cowan Carol → Mine No 1; 1976-06-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Coal Company Inc → Mine No 1; 1981-06-01 to 1986-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cowan Carol → Rocky Coal Company Inc; 1981-06-01 to 1986-11-02; source msha-controller-operator-history
- **operator_operates_mine:** D & R Coal Company Inc → Mine No 1; 1986-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cowan Rocky → Mine No 1; 1986-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cowan Rocky → D & R Coal Company Inc; 1986-11-03 to current/open; source msha-controller-operator-history