# Relationship history for MSHA mine 2902287

Current hierarchy: **Alonzo  Ramirez Jr → Ramirez & Sons, Inc. → R. S. I.   Pit**

- 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:** Ramirez & Sons, Inc. → R. S. I.   Pit; 2005-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alonzo  Ramirez Jr et al → R. S. I.   Pit; 2005-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alonzo  Ramirez Jr et al → Ramirez & Sons, Inc.; 2005-08-01 to current/open; source msha-controller-operator-history