# Relationship history for MSHA mine 2801042

Current hierarchy: **Michael K  Pierson; Richard E  Pierson Jr → Don Rogers Inc → Don Rogers Sand Pitt**

- 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

- **controller_controls_mine:** Michael K  Pierson et al → Don Rogers Sand Pitt; 2013-06-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Don Rogers Inc → Don Rogers Sand Pitt; 2013-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Pierson et al → Don Rogers Inc; 2013-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson Jr et al → Don Rogers Inc; 2013-10-23 to current/open; source msha-controller-operator-history