# Relationship history for MSHA mine 3503543

Current hierarchy: **Robert A  Mehan → Mehan & Sons LLC → Cinder Rock Products**

- 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:** Don Dunn → Cinder Rock Products; 2001-10-16 to 2025-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Don R  Dunn → Cinder Rock Products; 2001-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don R  Dunn → Don Dunn; 2001-10-16 to 2025-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Mehan & Sons LLC → Cinder Rock Products; 2025-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Mehan → Cinder Rock Products; 2025-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Mehan → Mehan & Sons LLC; 2025-03-17 to current/open; source msha-controller-operator-history