# Relationship history for MSHA mine 0502285

Current hierarchy: **Redland Plc → Broderick & Gibbons Inc → Strauss Pit**

- 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:** Broderick & Gibbons Inc → Strauss Pit; 1950-01-01 to 1980-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Gower William A → Strauss Pit; 1950-01-01 to 1980-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Gower William A → Broderick & Gibbons Inc; 1950-01-01 to 1980-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Broderick & Gibbons Inc → Strauss Pit; 1980-11-15 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Strauss Pit; 1980-11-15 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Broderick & Gibbons Inc; 1980-11-15 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Broderick & Gibbons Inc → Strauss Pit; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Strauss Pit; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Broderick & Gibbons Inc; 1988-11-14 to current/open; source msha-controller-operator-history