# Relationship history for MSHA mine 1511795

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

- 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

- **controller_controls_mine:** Epling Walter Ben & Michael R → No 1 Surface; 1975-09-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E & M Coal Company Inc → No 1 Surface; 1979-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Epling Walter Ben & Michael R → E & M Coal Company Inc; 1979-03-01 to current/open; source msha-controller-operator-history