# Relationship history for MSHA mine 3606203

Current hierarchy: **Everly James W → Yough Fuel & Energy Company Inc → Harr 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Yough Fuel & Energy Company Inc → Harr Strip; 1976-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Everly James W → Harr Strip; 1976-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everly James W → Yough Fuel & Energy Company Inc; 1976-09-20 to current/open; source msha-controller-operator-history