# Relationship history for MSHA mine 4503521

Current hierarchy: **Gary J  Trepanier → Gary J. Trepanier Excavating → Eagle 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Gary J. Trepanier Excavating → Eagle Crusher; 2002-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary J  Trepanier → Eagle Crusher; 2002-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary J  Trepanier → Gary J. Trepanier Excavating; 2002-10-10 to current/open; source msha-controller-operator-history