# Relationship history for MSHA mine 2002852

Current hierarchy: **Brad S  Doan; Dennis  Doan → Manchester Gravel & Concrete Products → Manchester Gravel & Concrete Products**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Manchester Gravel & Concrete Products Inc → Manchester Gravel & Concrete Products; 1990-09-01 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Lover → Manchester Gravel & Concrete Products; 1990-09-01 to 1999-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Lover → Manchester Gravel & Concrete Products Inc; 1990-09-01 to 1999-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Manchester Gravel & Concrete Products Inc → Manchester Gravel & Concrete Products; 1999-06-16 to 2001-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Doan et al → Manchester Gravel & Concrete Products; 1999-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Doan et al → Manchester Gravel & Concrete Products Inc; 1999-06-16 to 2001-03-23; source msha-controller-operator-history
- **controller_controls_operator:** Brad S  Doan et al → Manchester Gravel & Concrete Products Inc; 1999-06-16 to 2001-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Whittaker → Manchester Gravel & Concrete Products; 2001-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R L Whittaker & Company Inc → Manchester Gravel & Concrete Products; 2001-03-24 to 2003-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Whittaker → R L Whittaker & Company Inc; 2001-03-24 to 2003-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Manchester Gravel & Concrete Products → Manchester Gravel & Concrete Products; 2003-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad S  Doan et al → Manchester Gravel & Concrete Products; 2003-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Doan et al → Manchester Gravel & Concrete Products; 2003-08-28 to current/open; source msha-controller-operator-history