# Relationship history for MSHA mine 2102368

Current hierarchy: **Pat  Westman → Roadways Construction Inc → Cottonwood County Pits**

- 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:** Engdahl Herb → Cottonwood County Pits; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roadway'S Construction Inc → Cottonwood County Pits; 1981-07-01 to 1984-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Engdahl Herb → Roadway'S Construction Inc; 1981-07-01 to 1984-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Roadways Construction Inc → Cottonwood County Pits; 1984-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pat  Westman → Cottonwood County Pits; 1984-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pat  Westman → Roadways Construction Inc; 1984-11-14 to current/open; source msha-controller-operator-history