# Relationship history for MSHA mine 0300276

Current hierarchy: **Saint-Gobain → CertainTeed Gypsum Manufacturing Inc → CertainTeed Gypsum Manufacturing Inc**

- 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:** Weyerhaeuser Company → CertainTeed Gypsum Manufacturing Inc; 1950-01-01 to 1989-11-01; source msha-controller-operator-history
- **controller_controls_mine:** George  Weyerhaeuser et al → CertainTeed Gypsum Manufacturing Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Weyerhaeuser et al → Weyerhaeuser Company; 1950-01-01 to 1989-11-01; source msha-controller-operator-history
- **controller_controls_mine:** James Hardie Industries Ltd → CertainTeed Gypsum Manufacturing Inc; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boral Gypsum Inc → CertainTeed Gypsum Manufacturing Inc; 1989-11-02 to 1997-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Boral Limited → CertainTeed Gypsum Manufacturing Inc; 1989-11-02 to 1997-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Boral Limited → Boral Gypsum Inc; 1989-11-02 to 1997-01-31; source msha-controller-operator-history
- **operator_operates_mine:** James Hardie Gypsum Inc Nevada → CertainTeed Gypsum Manufacturing Inc; 1997-02-01 to 2002-04-25; source msha-controller-operator-history
- **controller_controls_operator:** James Hardie Industries Ltd → James Hardie Gypsum Inc Nevada; 1997-02-01 to 2002-04-25; source msha-controller-operator-history
- **controller_controls_mine:** BPB Plc → CertainTeed Gypsum Manufacturing Inc; 2002-04-25 to 2006-12-31; source msha-controller-operator-history
- **operator_operates_mine:** CertainTeed Gypsum Manufacturing Inc → CertainTeed Gypsum Manufacturing Inc; 2002-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BPB Plc → CertainTeed Gypsum Manufacturing Inc; 2002-04-26 to 2006-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Saint-Gobain → CertainTeed Gypsum Manufacturing Inc; 2007-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → CertainTeed Gypsum Manufacturing Inc; 2007-01-01 to current/open; source msha-controller-operator-history