# Relationship history for MSHA mine 3607321

Current hierarchy: **Wahl Earl K → West Newton Coal Logistics Company → West Newton Coal Logistics**

- 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:** West Newton Coal Logistics Company → West Newton Coal Logistics; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wahl Earl K Et Al → West Newton Coal Logistics; 1982-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wahl Earl K Et Al → West Newton Coal Logistics Company; 1982-05-01 to current/open; source msha-controller-operator-history