# Relationship history for MSHA mine 4104599

Current hierarchy: **Charles M  Hill → Romayor Aggregates Inc. → Romayor Sand**

- 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:** Romayor Aggregates Inc. → Romayor Sand; 2006-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles M  Hill → Romayor Sand; 2006-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles M  Hill → Romayor Aggregates Inc.; 2006-05-02 to current/open; source msha-controller-operator-history