# Relationship history for MSHA mine 4104813

Current hierarchy: **TNW (Texas Northwest Corp) → Southwest Railway Services → SRS 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:** Southwest Railway Services → SRS 1; 2010-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** TNW (Texas Northwest Corp) → SRS 1; 2010-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** TNW (Texas Northwest Corp) → Southwest Railway Services; 2010-03-08 to current/open; source msha-controller-operator-history