# Relationship history for MSHA mine 3102262

Current hierarchy: **Benjy D  Boyd; Ralph D  Boyd → Quality Stone LLC → Midnight Blue**

- 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:** Quality Stone LLC → Midnight Blue; 2010-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph D  Boyd et al → Midnight Blue; 2010-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph D  Boyd et al → Quality Stone LLC; 2010-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjy D  Boyd et al → Quality Stone LLC; 2010-11-03 to current/open; source msha-controller-operator-history