# Relationship history for MSHA mine 3001122

Current hierarchy: **Patricia  Aquilino; Douglas  Aquilino → Hard Rock Sand & Gravel Supply Inc → Hard Rock Sand & Gravel Supply Inc**

- 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:** Hardrock Sand & Gravel Inc → Hard Rock Sand & Gravel Supply Inc; 1950-01-01 to 2008-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Louis  De Simone → Hard Rock Sand & Gravel Supply Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louis  De Simone → Hardrock Sand & Gravel Inc; 1950-01-01 to 2008-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Sand & Gravel Supply Inc → Hard Rock Sand & Gravel Supply Inc; 2008-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patricia  Aquilino  et al → Hard Rock Sand & Gravel Supply Inc; 2008-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Aquilino  et al → Hard Rock Sand & Gravel Supply Inc; 2008-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Aquilino  et al → Hard Rock Sand & Gravel Supply Inc; 2008-12-10 to current/open; source msha-controller-operator-history