# Relationship history for MSHA mine 4001175

Current hierarchy: **Roger E  West → Sugar Ridge Coal Company Inc → Royal Blue Tipple**

- 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:** Rich John W (Ky-Tn-In) → Royal Blue Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ewell L Spradlin Coal Company → Royal Blue Tipple; 1950-01-01 to 1975-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Spradlin Ewell L → Royal Blue Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spradlin Ewell L → Ewell L Spradlin Coal Company; 1950-01-01 to 1975-08-31; source msha-controller-operator-history
- **operator_operates_mine:** High Top Coal Company Inc → Royal Blue Tipple; 1975-09-01 to 1980-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Rich John W (Ky-Tn-In) → High Top Coal Company Inc; 1975-09-01 to 1980-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → Royal Blue Tipple; 1976-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Asbury Harold F Et Al → Royal Blue Tipple; 1979-03-01 to 1982-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → Royal Blue Tipple; 1979-04-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southeast Coals Inc → Royal Blue Tipple; 1980-08-25 to 1981-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Southeast Coals Inc; 1980-08-25 to 1981-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Coal Processing Inc → Royal Blue Tipple; 1981-02-05 to 1982-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Asbury Harold F Et Al → Pioneer Coal Processing Inc; 1981-02-05 to 1982-10-11; source msha-controller-operator-history
- **operator_operates_mine:** Energy Inc → Royal Blue Tipple; 1982-10-12 to 1985-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Royal Blue Tipple; 1982-10-12 to 1985-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Energy Inc; 1982-10-12 to 1985-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Bradley Equipment Company Inc → Royal Blue Tipple; 1983-11-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cove Creek Energies Inc → Royal Blue Tipple; 1985-10-17 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Bradley Equipment Company Inc → Cove Creek Energies Inc; 1985-10-17 to 1986-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Rich Mountain Coal Company Inc → Royal Blue Tipple; 1986-07-22 to 1992-09-15; source msha-controller-operator-history
- **controller_controls_mine:** TECO Energy Inc → Royal Blue Tipple; 1986-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Rich Mountain Coal Company Inc; 1986-07-22 to 1992-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Ridge Coal Company Inc → Royal Blue Tipple; 1992-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Sugar Ridge Coal Company Inc; 1992-09-16 to current/open; source msha-controller-operator-history