# Relationship history for MSHA mine 5001955

Current hierarchy: **William W  Stearns → D&S Road Services → Screen 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:** D&S Road Services → Screen 1; 2011-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William W  Stearns → Screen 1; 2011-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William W  Stearns → D&S Road Services; 2011-02-28 to current/open; source msha-controller-operator-history