# Relationship history for MSHA mine 1519554

Current hierarchy: **Harley B  Bingham → B & B Coal Company Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** B & B Coal Company Inc → No 1; 2011-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harley B  Bingham → No 1; 2011-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harley B  Bingham → B & B Coal Company Inc; 2011-01-10 to current/open; source msha-controller-operator-history