# Relationship history for MSHA mine 4003610

Current hierarchy: **Gayla T  Hommel; Guy D  Hommel Jr → Hommel Concrete Company → Clear Creek Quarry**

- 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

- **controller_controls_mine:** Gayla T  Hommel et al → Clear Creek Quarry; 2009-05-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hommel Concrete Company → Clear Creek Quarry; 2024-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gayla T  Hommel et al → Hommel Concrete Company; 2024-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Guy D  Hommel Jr et al → Hommel Concrete Company; 2024-04-18 to current/open; source msha-controller-operator-history