# Relationship history for MSHA mine 4404510

Current hierarchy: **Epling Walter Ben & Michael R → E & M Coal Company Inc → No 1 Strip**

- 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:** Epling Walter Ben & Michael R → No 1 Strip; 1975-09-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E & M Coal Company Inc → No 1 Strip; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Epling Walter Ben & Michael R → E & M Coal Company Inc; 1976-09-01 to current/open; source msha-controller-operator-history