# Relationship history for MSHA mine 4103287

Current hierarchy: **Hanks M C → M C Hanks Concrete Corp → A I R X**

- 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:** M C Hanks Concrete Corp → A I R X; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanks M C → A I R X; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanks M C → M C Hanks Concrete Corp; 1985-02-01 to current/open; source msha-controller-operator-history