# Relationship history for MSHA mine 4404559

Current hierarchy: **Mack  Stiltner → Black Nugget Mining Inc → No 1 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

- **controller_controls_mine:** Walker George F → No 1 Mine; 1950-01-01 to 1982-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Harman Mining Corp → No 1 Mine; 1976-11-01 to 1981-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Walker George F → Harman Mining Corp; 1976-11-01 to 1981-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Inspiration Resources Corporation → No 1 Mine; 1981-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harman Mining Corp → No 1 Mine; 1981-12-10 to 1986-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Inspiration Resources Corporation → Harman Mining Corp; 1981-12-10 to 1986-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Barton Delmar → No 1 Mine; 1985-09-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Henry C Coal Company Inc → No 1 Mine; 1986-04-18 to 1986-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Barton Delmar → Henry C Coal Company Inc; 1986-04-18 to 1986-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Coal Dust Mining Company Inc → No 1 Mine; 1986-11-17 to 1989-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Lester Harold → No 1 Mine; 1986-11-17 to 1989-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Lester Harold → Coal Dust Mining Company Inc; 1986-11-17 to 1989-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Black Nugget Mining Inc → No 1 Mine; 1989-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mack  Stiltner et al → No 1 Mine; 1989-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mack  Stiltner et al → Black Nugget Mining Inc; 1989-07-18 to current/open; source msha-controller-operator-history