# Relationship history for MSHA mine 3303459

Current hierarchy: **Jay  Hall Jr → Quality Coal Company → Prater-Murdock Strip**

- 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

- **controller_controls_mine:** Jay  Hall Jr → Prater-Murdock Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Coal Company → Prater-Murdock Strip; 1976-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay  Hall Jr → Quality Coal Company; 1976-02-24 to current/open; source msha-controller-operator-history