# Relationship history for MSHA mine 4202038

Current hierarchy: **Grundy Wayne → Cove View Excavating → Cove View Portable Crusher**

- 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:** Cove View Excavating → Cove View Portable Crusher; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grundy Wayne → Cove View Portable Crusher; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grundy Wayne → Cove View Excavating; 1988-09-01 to current/open; source msha-controller-operator-history