# Relationship history for MSHA mine 0102307

Current hierarchy: **Needles Carl & Doris → Twin Energy Coal → Coal Valley Mine No 1**

- 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

- **operator_operates_mine:** Twin Energy Coal → Coal Valley Mine No 1; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Needles Carl & Doris → Coal Valley Mine No 1; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Needles Carl & Doris → Twin Energy Coal; 1981-03-01 to current/open; source msha-controller-operator-history