# Relationship history for MSHA mine 2801043

Current hierarchy: **Richard E  Pierson Jr; Michael K  Pierson → Diamond Materials, LLC → Fox Road Sand Pit**

- 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 → Fox Road Sand Pit; 2011-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael K  Pierson et al → Fox Road Sand Pit; 2013-06-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Don Rogers Inc → Fox Road Sand Pit; 2013-10-23 to 2017-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Pierson et al → Don Rogers Inc; 2013-10-23 to 2017-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson Jr et al → Don Rogers Inc; 2013-10-23 to 2017-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Materials, LLC → Fox Road Sand Pit; 2017-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K  Pierson et al → Diamond Materials, LLC; 2017-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Pierson Jr et al → Diamond Materials, LLC; 2017-08-11 to current/open; source msha-controller-operator-history