# Relationship history for MSHA mine 4202439

Current hierarchy: **Frank  Glinton; Charles  Bradley → Black Sands Holding → Black Sands 287**

- 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:** Black Sands Holding → Black Sands 287; 2006-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Glinton  et al → Black Sands 287; 2006-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Glinton  et al → Black Sands Holding; 2006-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Bradley  et al → Black Sands Holding; 2006-05-29 to current/open; source msha-controller-operator-history