# Relationship history for MSHA mine 4605361

Current hierarchy: **Murphy Frank → Mountaineer Fuel Inc → No 1 Surface**

- 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:** Mountaineer Fuel Inc → No 1 Surface; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Murphy Frank → No 1 Surface; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murphy Frank → Mountaineer Fuel Inc; 1976-09-01 to current/open; source msha-controller-operator-history