# Relationship history for MSHA mine 0500925

Current hierarchy: **James C  Marvel Jr → Ready Mixed Concrete Company → Ready Mixed Concrete Co Pit No 1**

- 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

- **operator_operates_mine:** Adams Aggregates Inc → Ready Mixed Concrete Co Pit No 1; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Powers Maxine → Ready Mixed Concrete Co Pit No 1; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Powers Maxine → Adams Aggregates Inc; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Ready Mixed Concrete Company → Ready Mixed Concrete Co Pit No 1; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank P Spratlen et al → Ready Mixed Concrete Co Pit No 1; 1978-07-01 to 2004-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Frank P Spratlen et al → Ready Mixed Concrete Company; 1978-07-01 to 2004-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Boral Limited → Ready Mixed Concrete Co Pit No 1; 2004-09-13 to 2018-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Boral Limited → Ready Mixed Concrete Company; 2004-09-13 to 2018-07-01; source msha-controller-operator-history
- **controller_controls_mine:** James C  Marvel Jr → Ready Mixed Concrete Co Pit No 1; 2018-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Marvel Jr → Ready Mixed Concrete Company; 2018-07-02 to current/open; source msha-controller-operator-history