# Relationship history for MSHA mine 3004050

Current hierarchy: **Dennis A  Cornell; Donald R  Benson → Portville-Obi Stone LLC → Portville-Obi Stone Gravel 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Portville-Obi Stone LLC → Portville-Obi Stone Gravel Mine; 2020-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Benson et al → Portville-Obi Stone Gravel Mine; 2020-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Benson et al → Portville-Obi Stone LLC; 2020-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis A  Cornell et al → Portville-Obi Stone LLC; 2020-04-22 to current/open; source msha-controller-operator-history