# Relationship history for MSHA mine 4703938

Current hierarchy: **Travis  Brooks → Brooks Excavating LLC → Mack Quarry**

- 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:** Brooks Excavating LLC → Mack Quarry; 2023-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Travis  Brooks → Mack Quarry; 2023-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Brooks → Brooks Excavating LLC; 2023-02-22 to current/open; source msha-controller-operator-history