# Relationship history for MSHA mine 2003246

Current hierarchy: **John  O'Connor → GREAT LAKES EXC. & EQUIP. RENTAL, INC. → PORTABLE 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

- **operator_operates_mine:** GREAT LAKES EXC. & EQUIP. RENTAL, INC. → PORTABLE PLANT #1; 2002-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  O'Connor → PORTABLE PLANT #1; 2002-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  O'Connor → GREAT LAKES EXC. & EQUIP. RENTAL, INC.; 2002-05-22 to current/open; source msha-controller-operator-history