# Relationship history for MSHA mine 3000949

Current hierarchy: **Fairchild Brothers Holding Company → I A Construction Corp → PORTVILLE SAND & GRAVEL**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** I A Construction Corp → PORTVILLE SAND & GRAVEL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → PORTVILLE SAND & GRAVEL; 1950-01-01 to 2026-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → I A Construction Corp; 1950-01-01 to 2026-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Fairchild Brothers Holding Company → PORTVILLE SAND & GRAVEL; 2026-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fairchild Brothers Holding Company → I A Construction Corp; 2026-02-20 to current/open; source msha-controller-operator-history