# Relationship history for MSHA mine 1514042

Current hierarchy: **Wilkerson Robert → Romar Mining Inc → Whiskey Hill**

- 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:** Wilkerson Robert → Whiskey Hill; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Romar Mining Inc → Whiskey Hill; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilkerson Robert → Romar Mining Inc; 1983-04-01 to current/open; source msha-controller-operator-history