# Relationship history for MSHA mine 5001474

Current hierarchy: **Willie Walt → W W Enterprises → Gravel Pit**

- 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:** Wallace Thillman → Gravel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Klondike-Alaska Incorporated → Gravel Pit; 1984-06-01 to 1988-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Wallace Thillman → Klondike-Alaska Incorporated; 1984-06-01 to 1988-10-25; source msha-controller-operator-history
- **operator_operates_mine:** W W Enterprises → Gravel Pit; 1988-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willie Walt → Gravel Pit; 1988-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willie Walt → W W Enterprises; 1988-10-26 to current/open; source msha-controller-operator-history