# Relationship history for MSHA mine 4404425

Current hierarchy: **Hagerman Elbert & Douglas Looney → Progressive Coal Company → No 4 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hagerman Elbert & Douglas Looney → No 4 Mine; 1975-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Progressive Coal Company → No 4 Mine; 1976-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hagerman Elbert & Douglas Looney → Progressive Coal Company; 1976-04-12 to current/open; source msha-controller-operator-history