# Relationship history for MSHA mine 0203140

Current hierarchy: **Derek W  Garland; Pedro C  Saucedo → Brand X Sand and Gravel → Brand X 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:** Brand X Sand and Gravel → Brand X Pit; 2006-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pedro C  Saucedo  et al → Brand X Pit; 2006-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pedro C  Saucedo  et al → Brand X Sand and Gravel; 2006-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek W  Garland  et al → Brand X Sand and Gravel; 2006-08-23 to current/open; source msha-controller-operator-history