# Relationship history for MSHA mine 4606924

Current hierarchy: **Schneider Ed → Mountaineer Crawler Service Inc → Shop Excavation**

- 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:** Mountaineer Crawler Service Inc → Shop Excavation; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schneider Ed → Shop Excavation; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schneider Ed → Mountaineer Crawler Service Inc; 1985-04-01 to current/open; source msha-controller-operator-history