# Relationship history for MSHA mine 3002792

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

- 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 → Watertown Plant; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc → Watertown Plant; 1987-05-01 to 1988-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc; 1987-05-01 to 1988-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Cobleskill Stone Products Inc → Watertown Plant; 1988-04-18 to 1990-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc → Watertown Plant; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emil J  Galasso et al → Watertown Plant; 2001-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Emil J  Galasso et al → Cobleskill Stone Products Inc; 2001-11-23 to 1990-04-30; source msha-controller-operator-history