# Relationship history for MSHA mine 3200639

Current hierarchy: **James R  Bradshaw → Bradshaw Gravel Supply Inc → Plant No 1 06 08**

- 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

- **operator_operates_mine:** Bradshaw Gravel Supply Inc → Plant No 1 06 08; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James R  Bradshaw et al → Plant No 1 06 08; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Bradshaw et al → Bradshaw Gravel Supply Inc; 1950-01-01 to current/open; source msha-controller-operator-history