# Relationship history for MSHA mine 2301372

Current hierarchy: **Saint-Gobain → GS II/Bird/CertainTeed → Gads Hill 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

- **operator_operates_mine:** Quality Aggregate Company → Gads Hill Plant; 1950-01-01 to 1984-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Missouri Pacific Corp → Gads Hill Plant; 1950-01-01 to 1984-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Missouri Pacific Corp → Quality Aggregate Company; 1950-01-01 to 1984-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Quality Aggregate Company → Gads Hill Plant; 1984-01-10 to 1996-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Union Pacific Corp → Gads Hill Plant; 1984-01-10 to 1996-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Union Pacific Corp → Quality Aggregate Company; 1984-01-10 to 1996-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Newgen Holding Inc → Gads Hill Plant; 1988-11-30 to 1999-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Gs Roofing Products Company Inc → Gads Hill Plant; 1996-09-17 to 1999-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Newgen Holding Inc → Gs Roofing Products Company Inc; 1996-09-17 to 1999-06-08; source msha-controller-operator-history
- **operator_operates_mine:** GS II/Bird/CertainTeed → Gads Hill Plant; 1999-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Saint-Gobain → Gads Hill Plant; 1999-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → GS II/Bird/CertainTeed; 1999-06-09 to current/open; source msha-controller-operator-history