# Relationship history for MSHA mine 2402361

Current hierarchy: **Brian M  Smith → B & M Stone → Kavalla 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

- **operator_operates_mine:** B & M Stone → Kavalla Quarry; 2004-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian M  Smith → Kavalla Quarry; 2004-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian M  Smith → B & M Stone; 2004-03-30 to current/open; source msha-controller-operator-history