# Relationship history for MSHA mine 4407409

Current hierarchy: **Jerry W  Wharton → J W Construction Company Inc → Hickory Gap Strip #4**

- 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

- **controller_controls_mine:** Jerry W  Wharton → Hickory Gap Strip #4; 2018-03-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J W Construction Company Inc → Hickory Gap Strip #4; 2021-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Wharton → J W Construction Company Inc; 2021-05-26 to current/open; source msha-controller-operator-history