# Relationship history for MSHA mine 3502713

Current hierarchy: **Zeigler Edward G → Lookingglass Construction & Rock Quarry → Weyerhauser 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

- **operator_operates_mine:** Lookingglass Construction & Rock Quarry → Weyerhauser Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Edward G → Weyerhauser Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Edward G → Lookingglass Construction & Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history