# Relationship history for MSHA mine 4002843

Current hierarchy: **Phillips Leon G & Rebecca → Becca Ann Coal Company → No 2**

- 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:** Blue Ridge Coal Company Inc → No 2; 1983-11-01 to 1984-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Roger E  West → No 2; 1983-11-01 to 1984-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Roger E  West → Blue Ridge Coal Company Inc; 1983-11-01 to 1984-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Becca Ann Coal Company → No 2; 1984-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Leon G & Rebecca → No 2; 1984-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Leon G & Rebecca → Becca Ann Coal Company; 1984-10-22 to current/open; source msha-controller-operator-history