# Relationship history for MSHA mine 2902337

Current hierarchy: **Buddy  Sonchar → B T U Block & Concrete Inc → TMR Pit**

- 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

- **controller_controls_mine:** Buddy  Sonchar → TMR Pit; 1984-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B T U Block & Concrete Inc → TMR Pit; 2007-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buddy  Sonchar → B T U Block & Concrete Inc; 2007-03-02 to current/open; source msha-controller-operator-history