# Relationship history for MSHA mine 1515052

Current hierarchy: **John M  Potter; Thomas A  Potter → Sunny Ridge Mining Company Inc → No 11 Surface**

- 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:** United  Company → No 11 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H K Coal Inc → No 11 Surface; 1985-01-01 to 1986-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Terry Charles  Marshall → No 11 Surface; 1985-01-01 to 1986-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Terry Charles  Marshall → H K Coal Inc; 1985-01-01 to 1986-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → No 11 Surface; 1986-02-28 to 1990-07-08; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1986-02-28 to 1990-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Thomas A  Potter et al → No 11 Surface; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Good Hope Mining Inc → No 11 Surface; 1990-07-09 to 1993-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Charles Harry → No 11 Surface; 1990-07-09 to 1993-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles Harry → Good Hope Mining Inc; 1990-07-09 to 1993-01-04; source msha-controller-operator-history
- **operator_operates_mine:** Sunny Ridge Mining Company Inc → No 11 Surface; 1993-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Sunny Ridge Mining Company Inc; 1993-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Sunny Ridge Mining Company Inc; 1993-01-05 to current/open; source msha-controller-operator-history