# Relationship history for MSHA mine 4105597

Current hierarchy: **Ruben  Garibay → Select Quality Materials and Concrete → SQMC 2**

- 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:** Ruben  Garibay et al → SQMC 2; 2022-01-03 to 2023-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Select Quality Materials and Concrete → SQMC 2; 2022-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Garibay et al → Select Quality Materials and Concrete; 2022-01-07 to 2023-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Arturo  Morales et al → Select Quality Materials and Concrete; 2022-01-07 to 2023-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Ruben  Garibay → SQMC 2; 2023-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Garibay → Select Quality Materials and Concrete; 2023-01-08 to current/open; source msha-controller-operator-history