# Relationship history for MSHA mine 4503294

Current hierarchy: **Michael L  Fagley → Alpine Concrete & Excavation, Inc. → Alpine Concrete & Excavation, Inc**

- 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:** Don Giddings Construction → Alpine Concrete & Excavation, Inc; 1993-04-01 to 2006-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Belinda K  Giddings → Alpine Concrete & Excavation, Inc; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belinda K  Giddings → Don Giddings Construction; 1993-04-01 to 2006-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Alpine Concrete & Excavation Inc → Alpine Concrete & Excavation, Inc; 2006-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael L  Fagley → Alpine Concrete & Excavation, Inc; 2006-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael L  Fagley → Alpine Concrete & Excavation Inc; 2006-04-12 to current/open; source msha-controller-operator-history