# Relationship history for MSHA mine 4105439

Current hierarchy: **Burnco Rock Products Ltd → BURNCO Texas, LLC → Shoreline Aggregate 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

- **controller_controls_mine:** Burnco Rock Products Ltd → Shoreline Aggregate Quarry; 2015-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BURNCO Texas, LLC → Shoreline Aggregate Quarry; 2019-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burnco Rock Products Ltd → BURNCO Texas, LLC; 2019-05-20 to current/open; source msha-controller-operator-history