# Relationship history for MSHA mine 4608169

Current hierarchy: **Ashland Inc → Sharples Coal Corp → Coalburg No 6-A**

- 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:** Sharples Coal Corp → Coalburg No 6-A; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Coalburg No 6-A; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Sharples Coal Corp; 1992-04-01 to current/open; source msha-controller-operator-history