# Relationship history for MSHA mine 4000047

Current hierarchy: **Greene County-Tn → Greene County Highway Department-Tn → Greene County Hwy Dept Cove Creek Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Greene County Highway Department-Tn → Greene County Hwy Dept Cove Creek Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greene County-Tn → Greene County Hwy Dept Cove Creek Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greene County-Tn → Greene County Highway Department-Tn; 1950-01-01 to current/open; source msha-controller-operator-history