# Relationship history for MSHA mine 4503658

Current hierarchy: **Michael  Leboki → Construction Materials Exchange LLC → 88st Crusher**

- 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:** Construction Materials Exchange LLC → 88st Crusher; 2009-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Leboki et al → 88st Crusher; 2009-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Leboki et al → Construction Materials Exchange LLC; 2009-02-26 to current/open; source msha-controller-operator-history