# Relationship history for MSHA mine 0301988

Current hierarchy: **Waylan  Henley; Tony  Stewart → Bluebird Sand LLC → Bluebird Sand**

- 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

- **operator_operates_mine:** Bluebird Sand LLC → Bluebird Sand; 2010-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tony  Stewart et al → Bluebird Sand; 2010-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Stewart et al → Bluebird Sand LLC; 2010-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waylan  Henley et al → Bluebird Sand LLC; 2010-02-05 to current/open; source msha-controller-operator-history