# Relationship history for MSHA mine 2002449

Current hierarchy: **Colas S A → Barrett Paving Materials Inc → HEWITT ROBINS PORTABLE #113**

- 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

- **operator_operates_mine:** Standard Gravel Company → HEWITT ROBINS PORTABLE #113; 1979-01-01 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Whittaker & Gooding Company → HEWITT ROBINS PORTABLE #113; 1979-01-01 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Whittaker & Gooding Company → Standard Gravel Company; 1979-01-01 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → HEWITT ROBINS PORTABLE #113; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whittaker-Gooding Agg → HEWITT ROBINS PORTABLE #113; 1981-06-26 to 1989-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Barrett Paving Materials Inc & Whittaker & Gooding → HEWITT ROBINS PORTABLE #113; 1981-06-26 to 1989-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Barrett Paving Materials Inc & Whittaker & Gooding → Whittaker-Gooding Agg; 1981-06-26 to 1989-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc → HEWITT ROBINS PORTABLE #113; 1989-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc; 1989-08-28 to current/open; source msha-controller-operator-history