# Relationship history for MSHA mine 2402030

Current hierarchy: **State Of Montana → Montana Department Of Transportation → SCREEN #63-8171**

- 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:** State Of Montana → SCREEN #63-8171; 1992-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Montana Department Of Transportation → SCREEN #63-8171; 1993-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Of Montana → Montana Department Of Transportation; 1993-02-01 to current/open; source msha-controller-operator-history