# Relationship history for MSHA mine 4002391

Current hierarchy: **Roger E  West → Sugar Ridge Coal Company Inc → Area No 6**

- 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:** Caryville Coal Company Inc → Area No 6; 1978-01-01 to 1979-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Aldridge Frank → Area No 6; 1978-01-01 to 1979-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Aldridge Frank → Caryville Coal Company Inc; 1978-01-01 to 1979-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Ridge Coal Company Inc → Area No 6; 1979-04-24 to 1987-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → Area No 6; 1979-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Sugar Ridge Coal Company Inc; 1979-04-24 to 1987-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Ridge Coal Company Inc → Area No 6; 1987-04-08 to 1988-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Cowan Dan & Brian Bartley → Area No 6; 1987-04-08 to 1988-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Cowan Dan & Brian Bartley → Sugar Ridge Coal Company Inc; 1987-04-08 to 1988-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Ridge Coal Company Inc → Area No 6; 1988-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Sugar Ridge Coal Company Inc; 1988-10-17 to current/open; source msha-controller-operator-history