# Relationship history for MSHA mine 0301905

Current hierarchy: **Ronald H  Hayhurst; Kenneth  Hamilton → H & H Stone Company, LLC → H & H Stone Company, LLC**

- 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:** H & H Stone Company, LLC → H & H Stone Company, LLC; 2005-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Hamilton et al → H & H Stone Company, LLC; 2005-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Hamilton et al → H & H Stone Company, LLC; 2005-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald H  Hayhurst et al → H & H Stone Company, LLC; 2005-01-12 to current/open; source msha-controller-operator-history