# Relationship history for MSHA mine 4700845

Current hierarchy: **Joseph  Murphy → Mcc Inc → Murphy Concrete & Construction**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Joseph  Murphy → Murphy Concrete & Construction; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grogan Ready Mix Concrete Company → Murphy Concrete & Construction; 1950-01-01 to 1985-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Grogan Robert J → Murphy Concrete & Construction; 1950-01-01 to 1985-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Grogan Robert J → Grogan Ready Mix Concrete Company; 1950-01-01 to 1985-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Mcc Inc → Murphy Concrete & Construction; 1985-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Murphy → Mcc Inc; 1985-09-10 to current/open; source msha-controller-operator-history