# Relationship history for MSHA mine 0300466

Current hierarchy: **Saint-Gobain → CertainTeed → Glenwood Quarry**

- 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:** Bird & Son Inc → Glenwood Quarry; 1950-01-01 to 1985-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Ralph E  Heim → Glenwood Quarry; 1950-01-01 to 1985-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Ralph E  Heim → Bird & Son Inc; 1950-01-01 to 1985-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Glenwood Quarry; 1985-02-16 to 1987-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Roofing Products Company → Glenwood Quarry; 1985-08-06 to 1987-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Roofing Products Company; 1985-08-06 to 1987-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Gs Roofing Products Company Inc → Glenwood Quarry; 1987-05-08 to 1988-11-29; source msha-controller-operator-history
- **controller_controls_mine:** R L  Lambden → Glenwood Quarry; 1987-05-08 to 1988-11-29; source msha-controller-operator-history
- **controller_controls_operator:** R L  Lambden → Gs Roofing Products Company Inc; 1987-05-08 to 1988-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Gs Roofing Products Company Inc → Glenwood Quarry; 1988-11-30 to 1999-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Newgen Holding Inc → Glenwood Quarry; 1988-11-30 to 1999-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Newgen Holding Inc → Gs Roofing Products Company Inc; 1988-11-30 to 1999-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Saint-Gobain → Glenwood Quarry; 1999-06-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** GS Roofing Products Incorporated → Glenwood Quarry; 1999-08-05 to 2005-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Saint-Gobain → Glenwood Quarry; 1999-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → GS Roofing Products Incorporated; 1999-08-05 to 2005-04-21; source msha-controller-operator-history
- **operator_operates_mine:** CertainTeed → Glenwood Quarry; 2005-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → CertainTeed; 2005-04-22 to current/open; source msha-controller-operator-history