# Relationship history for MSHA mine 0202398

Current hierarchy: **Geupel Carl M Construction Company Inc → Arizona Crushers Inc → Portable Wash Plant #2**

- 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:** Geupel Carl M Construction Company Inc → Portable Wash Plant #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arizona Crushers Inc → Portable Wash Plant #2; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geupel Carl M Construction Company Inc → Arizona Crushers Inc; 1987-10-01 to current/open; source msha-controller-operator-history