# Relationship history for MSHA mine 4102531

Current hierarchy: **Carr Don → Daley Aggregates Inc → Alleyton 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Columbus Construction Material Company Inc → Alleyton Pit; 1950-01-01 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Ilse Ellis → Alleyton Pit; 1950-01-01 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Ilse Ellis → Columbus Construction Material Company Inc; 1950-01-01 to 1981-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Daley Aggregates Inc → Alleyton Pit; 1981-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carr Don → Alleyton Pit; 1981-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carr Don → Daley Aggregates Inc; 1981-02-18 to current/open; source msha-controller-operator-history