# Relationship history for MSHA mine 0302051

Current hierarchy: **Roth (John)  Horner III → Horner Holdings Inc → Big Oak Sand & Gravel #2**

- 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:** Roth (John)  Horner III → Big Oak Sand & Gravel #2; 2012-09-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Horner Holdings Inc → Big Oak Sand & Gravel #2; 2015-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roth (John)  Horner III → Horner Holdings Inc; 2015-11-24 to current/open; source msha-controller-operator-history