# Relationship history for MSHA mine 2302518

Current hierarchy: **BMC Enterprises Inc → BMC Stone, LLC → High Hill 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:** BMC Enterprises Inc → High Hill Quarry; 2014-11-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BMC Stone, LLC → High Hill Quarry; 2017-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BMC Enterprises Inc → BMC Stone, LLC; 2017-05-11 to current/open; source msha-controller-operator-history