# Relationship history for MSHA mine 4105616

Current hierarchy: **Herman A Acosta Sr → Big Bend Materials LLC → Presidio Sand Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Big Bend Materials LLC → Presidio Sand Plant; 2022-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herman A Acosta Sr → Presidio Sand Plant; 2022-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herman A Acosta Sr → Big Bend Materials LLC; 2022-10-20 to current/open; source msha-controller-operator-history