# Relationship history for MSHA mine 1517577

Current hierarchy: **El Paso Energy Corp → Enterprise Coal Company → Arnold Fork Mine No 1**

- 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:** El Paso Energy Corp → Arnold Fork Mine No 1; 1979-06-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Enterprise Coal Company → Arnold Fork Mine No 1; 1994-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Enterprise Coal Company; 1994-08-01 to current/open; source msha-controller-operator-history