# Relationship history for MSHA mine 3304125

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Davon, LLC → SCIOTO VALLEY RESOURCES**

- 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:** Scioto Valley Resources Div/Davon Inc → SCIOTO VALLEY RESOURCES; 1988-01-01 to 2001-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Davon Inc → SCIOTO VALLEY RESOURCES; 1988-01-01 to 2001-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Davon Inc → Scioto Valley Resources Div/Davon Inc; 1988-01-01 to 2001-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Davon, LLC → SCIOTO VALLEY RESOURCES; 2001-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → SCIOTO VALLEY RESOURCES; 2001-03-31 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Davon, LLC; 2001-03-31 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → SCIOTO VALLEY RESOURCES; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Davon, LLC; 2007-08-23 to current/open; source msha-controller-operator-history