# Relationship history for MSHA mine 1519733

Current hierarchy: **Quest Energy Corporation → Samuel Coal Co., Inc → No. 1 Face Up**

- 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:** Samuel Coal Co., Inc → No. 1 Face Up; 2014-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quest Energy Corporation → No. 1 Face Up; 2014-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quest Energy Corporation → Samuel Coal Co., Inc; 2014-01-10 to current/open; source msha-controller-operator-history