# Relationship history for MSHA mine 1505324

Current hierarchy: **Stanley Michael R → Stonewall Mining Inc → No 2 Mine**

- 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:** Debra Coal Company → No 2 Mine; 1950-01-01 to 1975-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Jack T & Dennie Bentley → No 2 Mine; 1950-01-01 to 1975-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Jack T & Dennie Bentley → Debra Coal Company; 1950-01-01 to 1975-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Francis Robert L → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dunavant Enterprises Inc → No 2 Mine; 1975-06-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Valley Coal Corp → No 2 Mine; 1975-10-29 to 1986-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Dunavant Enterprises Inc → Coal Valley Coal Corp; 1975-10-29 to 1986-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Barbara Kay Coal Corp → No 2 Mine; 1986-09-02 to 1989-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Francis Robert L → Barbara Kay Coal Corp; 1986-09-02 to 1989-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Stanley Michael R → No 2 Mine; 1988-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stonewall Mining Inc → No 2 Mine; 1989-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley Michael R → Stonewall Mining Inc; 1989-03-10 to current/open; source msha-controller-operator-history