# Relationship history for MSHA mine 1800747

Current hierarchy: **Wienerberger AG → Cherokee Sanford Brick → BUCKEYSTOWN #1**

- 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:** Cherokee Sanford Brick → BUCKEYSTOWN #1; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → BUCKEYSTOWN #1; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → Cherokee Sanford Brick; 2000-02-01 to current/open; source msha-controller-operator-history