# Relationship history for MSHA mine 3401357

Current hierarchy: **Turner Charles Richard-William Tom Turner → Turner Brothers Inc → Welch Mine No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Turner Charles Richard-William Tom Turner Et Al → Welch Mine No 1; 1980-10-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Turner Brothers Inc → Welch Mine No 1; 1982-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turner Charles Richard-William Tom Turner Et Al → Turner Brothers Inc; 1982-04-01 to current/open; source msha-controller-operator-history