# Relationship history for MSHA mine 3607748

Current hierarchy: **Fairchild Brothers Holding Company → I A Construction Corp → CHAPMANVILLE PORTABLE**

- 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:** Colas S A → CHAPMANVILLE PORTABLE; 1950-01-01 to 2026-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Wood Richard L & Richard A → CHAPMANVILLE PORTABLE; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wood Gravel Company → CHAPMANVILLE PORTABLE; 1985-10-01 to 1996-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Wood Richard L & Richard A → Wood Gravel Company; 1985-10-01 to 1996-09-02; source msha-controller-operator-history
- **operator_operates_mine:** I A Construction Corp → CHAPMANVILLE PORTABLE; 1996-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → I A Construction Corp; 1996-09-03 to 2026-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Fairchild Brothers Holding Company → CHAPMANVILLE PORTABLE; 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