# Relationship history for MSHA mine 4606968

Current hierarchy: **Pack Bill → Willhaven Inc → Ragland 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Willhaven Inc → Ragland Surface; 1985-06-01 to 1985-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Crew Willis → Ragland Surface; 1985-06-01 to 1985-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Crew Willis → Willhaven Inc; 1985-06-01 to 1985-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Willhaven Inc → Ragland Surface; 1985-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pack Bill → Ragland Surface; 1985-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pack Bill → Willhaven Inc; 1985-11-22 to current/open; source msha-controller-operator-history