# Relationship history for MSHA mine 3400572

Current hierarchy: **Mayfield  Mc Craw → McCraw Materials Oklahoma → Cromwell 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sand Dredging Company Inc → Cromwell Pit; 1950-01-01 to 2004-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Floyd L  Perryman → Cromwell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Floyd L  Perryman → Sand Dredging Company Inc; 1950-01-01 to 2004-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Mayfield  Mc Craw → Cromwell Pit; 1999-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McCraw Materials Oklahoma → Cromwell Pit; 2004-01-22 to 2005-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Mayfield  Mc Craw → McCraw Materials Oklahoma; 2004-01-22 to 2005-06-28; source msha-controller-operator-history
- **operator_operates_mine:** McCraw Materials Oklahoma → Cromwell Pit; 2005-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mayfield  Mc Craw → Cromwell Pit; 2005-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mayfield  Mc Craw → McCraw Materials Oklahoma; 2005-06-29 to current/open; source msha-controller-operator-history