# Relationship history for MSHA mine 1514920

Current hierarchy: **Betty  Adams; Paul  Woodrow → Chacko Coal Company → Chacko Coal Company 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:** Chacko Coal Company → Chacko Coal Company Mine No 1; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Woodrow et al → Chacko Coal Company Mine No 1; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Woodrow et al → Chacko Coal Company; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Betty  Adams et al → Chacko Coal Company; 1984-10-01 to current/open; source msha-controller-operator-history