# Relationship history for MSHA mine 4104808

Current hierarchy: **Salinas Family Trust; Ruben  Salinas Sr → Columbus Materials → Columbus Materials**

- 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:** Columbus Materials → Columbus Materials; 2010-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ruben  Salinas Sr  et al → Columbus Materials; 2010-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Salinas Sr  et al → Columbus Materials; 2010-01-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salinas Family Trust  et al → Columbus Materials; 2010-01-25 to current/open; source msha-controller-operator-history