# Relationship history for MSHA mine 2401761

Current hierarchy: **Midboe Construction → Midboe Construction → Underdahl 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:** Midboe Construction → Underdahl Pit; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Midboe Construction → Underdahl Pit; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Midboe Construction → Midboe Construction; 1984-04-01 to current/open; source msha-controller-operator-history