# Relationship history for MSHA mine 4405371

Current hierarchy: **Large Curtis → Dixie Mining Inc → No 1a Mine**

- 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:** Dixie Mining Inc → No 1a Mine; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Large Curtis Et Al → No 1a Mine; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Large Curtis Et Al → Dixie Mining Inc; 1980-01-01 to current/open; source msha-controller-operator-history