# Relationship history for MSHA mine 3401566

Current hierarchy: **Bradshaw S R → Bradshaw Materials → Bradshaw 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

- **operator_operates_mine:** Bradshaw Materials → Bradshaw Pit; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradshaw S R → Bradshaw Pit; 1986-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradshaw S R → Bradshaw Materials; 1986-07-01 to current/open; source msha-controller-operator-history