# Relationship history for MSHA mine 3605699

Current hierarchy: **Fairchild Brothers Holding Company → I A Construction Corp → PLAIN GROVE 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Colas S A → PLAIN GROVE SAND & GRAVEL; 1950-01-01 to 2026-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Northern Industries Inc → PLAIN GROVE SAND & GRAVEL; 1950-01-01 to 1990-03-01; source msha-controller-operator-history
- **controller_controls_mine:** George W Will → PLAIN GROVE SAND & GRAVEL; 1950-01-01 to 1990-03-01; source msha-controller-operator-history
- **controller_controls_operator:** George W Will → Northern Industries Inc; 1950-01-01 to 1990-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Northern Industries Inc → PLAIN GROVE SAND & GRAVEL; 1990-03-02 to 1994-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Norco Holdings Inc → PLAIN GROVE SAND & GRAVEL; 1990-03-02 to 1994-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Norco Holdings Inc → Northern Industries Inc; 1990-03-02 to 1994-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Medure Aggregates Company Inc → PLAIN GROVE SAND & GRAVEL; 1994-06-20 to 1999-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Angelo  Medure → PLAIN GROVE SAND & GRAVEL; 1994-06-20 to 1999-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Angelo  Medure → Medure Aggregates Company Inc; 1994-06-20 to 1999-04-18; source msha-controller-operator-history
- **operator_operates_mine:** I A Construction Corp → PLAIN GROVE SAND & GRAVEL; 1999-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → I A Construction Corp; 1999-04-19 to 2026-02-19; source msha-controller-operator-history
- **controller_controls_mine:** Fairchild Brothers Holding Company → PLAIN GROVE 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