# Relationship history for MSHA mine 3102267

Current hierarchy: **Benjy D  Boyd; Ralph D  Boyd → H&B Stone, LLC → H&B Mine**

- 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:** H&B Stone, LLC → H&B Mine; 2011-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Benjy D  Boyd et al → H&B Mine; 2011-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjy D  Boyd et al → H&B Stone, LLC; 2011-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph D  Boyd et al → H&B Stone, LLC; 2011-09-05 to current/open; source msha-controller-operator-history