# Relationship history for MSHA mine 1001550

Current hierarchy: **Brown John F & Donald M Poe → Western Crushing Company → Cedar Creek Pit**

- 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:** Brown John F & Donald M Poe → Cedar Creek Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Crushing Company → Cedar Creek Pit; 1981-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown John F & Donald M Poe → Western Crushing Company; 1981-08-01 to current/open; source msha-controller-operator-history