# Relationship history for MSHA mine 2602209

Current hierarchy: **Roy A  Walker → W E S Construction Company Inc → Ren Mine**

- 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:** W E S Construction Company Inc → Ren Mine; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy A  Walker → Ren Mine; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy A  Walker → W E S Construction Company Inc; 1992-05-01 to current/open; source msha-controller-operator-history