# Relationship history for MSHA mine 4503610

Current hierarchy: **Michael  Leboki → CME-Construction Materials Exchange → Screen Plant 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

- **controller_controls_mine:** Michael  Leboki et al → Screen Plant 1; 2006-06-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CME-Construction Materials Exchange → Screen Plant 1; 2006-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Leboki et al → CME-Construction Materials Exchange; 2006-07-12 to current/open; source msha-controller-operator-history