# Relationship history for MSHA mine 3304106

Current hierarchy: **Colas S A → Barrett Paving Materials Inc → Barrett Paving Materials**

- 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 → Barrett Paving Materials; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miami Asphalt Inc → Barrett Paving Materials; 1987-04-01 to 1990-05-08; source msha-controller-operator-history
- **controller_controls_mine:** Northwood Group Inc → Barrett Paving Materials; 1987-04-01 to 1990-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Northwood Group Inc → Miami Asphalt Inc; 1987-04-01 to 1990-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc → Barrett Paving Materials; 1990-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc; 1990-05-09 to current/open; source msha-controller-operator-history