# Relationship history for MSHA mine 0301870

Current hierarchy: **Rogers Group Inc → Rogers Group Inc. → Cord 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

- **controller_controls_mine:** Rogers Group Inc → Cord Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bradley Contracting Inc → Cord Quarry; 2003-03-19 to 2024-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Randy L  Bradley → Cord Quarry; 2003-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy L  Bradley → Bradley Contracting Inc; 2003-03-19 to 2024-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc. → Cord Quarry; 2024-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc.; 2024-02-12 to current/open; source msha-controller-operator-history