# Relationship history for MSHA mine 4405784

Current hierarchy: **Horn Bill E → Slate Creek Energy Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cumberland Mining Corp → No 1; 1981-10-01 to 1982-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Curtis Robert M → No 1; 1981-10-01 to 1982-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Curtis Robert M → Cumberland Mining Corp; 1981-10-01 to 1982-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Slate Creek Energy Inc → No 1; 1982-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horn Bill E → No 1; 1982-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horn Bill E → Slate Creek Energy Inc; 1982-01-19 to current/open; source msha-controller-operator-history