# Relationship history for MSHA mine 1800499

Current hierarchy: **Ware William → Ware Coal Company → No 1 Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** G & H Coal Co Inc → No 1 Strip; 1950-01-01 to 1974-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Hughes William → No 1 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hughes William → G & H Coal Co Inc; 1950-01-01 to 1974-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Ware Coal Company → No 1 Strip; 1974-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ware William → No 1 Strip; 1974-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ware William → Ware Coal Company; 1974-04-16 to current/open; source msha-controller-operator-history