# Relationship history for MSHA mine 4103477

Current hierarchy: **Halliburton Company → Brown & Root (U S A) Inc → Stacy Dam Project**

- 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 → Stacy Dam Project; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown & Root (U S A) Inc → Stacy Dam Project; 1987-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halliburton Company → Brown & Root (U S A) Inc; 1987-08-01 to current/open; source msha-controller-operator-history