# Relationship history for MSHA mine 2402018

Current hierarchy: **Mackay Edward → Washington Gulch L P Inc → Washington Gulch Mine**

- 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:** Washington Gulch L P Inc → Washington Gulch Mine; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mackay Edward → Washington Gulch Mine; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mackay Edward → Washington Gulch L P Inc; 1993-08-01 to current/open; source msha-controller-operator-history