# Relationship history for MSHA mine 5001604

Current hierarchy: **James D  West Jr → Board Of Trade Inc → Thunderbird Crusher**

- 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:** Board Of Trade Inc → Thunderbird Crusher; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James D  West Sr → Thunderbird Crusher; 1991-07-01 to 2017-08-20; source msha-controller-operator-history
- **controller_controls_operator:** James D  West Sr → Board Of Trade Inc; 1991-07-01 to 2017-08-20; source msha-controller-operator-history
- **controller_controls_mine:** James D  West Jr → Thunderbird Crusher; 2017-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  West Jr → Board Of Trade Inc; 2017-08-21 to current/open; source msha-controller-operator-history