# Relationship history for MSHA mine 4104632

Current hierarchy: **Liborio  Garcia; Sergio  Mata → Rockwall Material Center, LLC. → Stone Del Milagro**

- 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:** Rockwall Material Center, LLC. → Stone Del Milagro; 2006-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sergio  Mata et al → Stone Del Milagro; 2006-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sergio  Mata et al → Rockwall Material Center, LLC.; 2006-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Liborio  Garcia et al → Rockwall Material Center, LLC.; 2006-12-07 to current/open; source msha-controller-operator-history