# Relationship history for MSHA mine 2003574

Current hierarchy: **Heidi  Salisbury → Higher Ground Aggregates → Lucas 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Higher Ground Aggregates → Lucas Mine; 2019-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidi  Salisbury → Lucas Mine; 2019-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidi  Salisbury → Higher Ground Aggregates; 2019-02-25 to current/open; source msha-controller-operator-history