# Relationship history for MSHA mine 4105127

Current hierarchy: **Burnco Rock Products Ltd → BURNCO TEXAS LLC → Branham Sand & Gravel 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** BURNCO TEXAS LLC → Branham Sand & Gravel Pit; 2015-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burnco Rock Products Ltd → Branham Sand & Gravel Pit; 2015-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burnco Rock Products Ltd → BURNCO TEXAS LLC; 2015-05-08 to current/open; source msha-controller-operator-history