# Relationship history for MSHA mine 2602218

Current hierarchy: **Halliburton Company → Brown & Root Inc → Gold Bar**

- 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

- **controller_controls_mine:** Halliburton Company → Gold Bar; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown & Root Inc → Gold Bar; 1992-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Brown & Root Inc; 1992-11-01 to current/open; source msha-controller-operator-history