# Relationship history for MSHA mine 1601456

Current hierarchy: **Lisa L  Coleman → Sand Hill Aggregates LLC → Sand Hill Aggregates LLC**

- 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:** Sand Hill Aggregates LLC → Sand Hill Aggregates LLC; 2007-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lisa L  Coleman → Sand Hill Aggregates LLC; 2007-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lisa L  Coleman → Sand Hill Aggregates LLC; 2007-05-11 to current/open; source msha-controller-operator-history