# Relationship history for MSHA mine 0202581

Current hierarchy: **Halvorson Kent → Halvorson Construction → Millers Wash 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:** Halvorson Construction → Millers Wash Pit; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Halvorson Kent → Millers Wash Pit; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halvorson Kent → Halvorson Construction; 1992-08-01 to current/open; source msha-controller-operator-history