# Relationship history for MSHA mine 1510951

Current hierarchy: **Charles  Turner → B & L Coal Company Inc → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Charles  Turner → No 3 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & L Coal Company Inc → No 3 Mine; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Turner → B & L Coal Company Inc; 1977-11-01 to current/open; source msha-controller-operator-history