# Relationship history for MSHA mine 1900461

Current hierarchy: **Paul W  Bradshaw → P Bradshaw Corp → Southeastern Sand**

- 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:** Southeastern Sand & Gravel Inc → Southeastern Sand; 1950-01-01 to 1988-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Miller Donald → Southeastern Sand; 1950-01-01 to 1988-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Miller Donald → Southeastern Sand & Gravel Inc; 1950-01-01 to 1988-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Paul W  Bradshaw → Southeastern Sand; 1987-03-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P Bradshaw Corp → Southeastern Sand; 1988-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul W  Bradshaw → P Bradshaw Corp; 1988-09-02 to current/open; source msha-controller-operator-history