# Relationship history for MSHA mine 1700808

Current hierarchy: **Michael S  Copp → Copp Excavation → Tuppers 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Copp Excavation → Tuppers Pit; 2006-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael S  Copp → Tuppers Pit; 2006-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael S  Copp → Copp Excavation; 2006-11-08 to current/open; source msha-controller-operator-history