# Relationship history for MSHA mine 1401848

Current hierarchy: **Roger D  Whetstine Jr → Whetrock inc → Portable 3**

- 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:** Roger D  Whetstine Jr → Portable 3; 2010-03-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whetrock inc → Portable 3; 2024-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger D  Whetstine Jr → Whetrock inc; 2024-11-08 to current/open; source msha-controller-operator-history