# Relationship history for MSHA mine 4003437

Current hierarchy: **Galen Lee  Buck → Buck Stone → Buck 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:** Buck Stone → Buck Quarry; 2014-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Galen Lee  Buck → Buck Quarry; 2014-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Galen Lee  Buck → Buck Stone; 2014-01-22 to current/open; source msha-controller-operator-history