# Relationship history for MSHA mine 2301867

Current hierarchy: **Blackman Reed Jr → Reed Blackman Jr → Reed Blackman Jr Pit & Mill**

- 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:** Reed Blackman Jr → Reed Blackman Jr Pit & Mill; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackman Reed Jr → Reed Blackman Jr Pit & Mill; 1982-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackman Reed Jr → Reed Blackman Jr; 1982-02-01 to current/open; source msha-controller-operator-history