# Relationship history for MSHA mine 1505055

Current hierarchy: **El Paso Energy Corp → Coastal Coal Company, LLC → Skyline 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

- **operator_operates_mine:** South-East Coal Company Inc → Skyline Mine No. 1; 1950-01-01 to 1999-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Harry  LaViers Jr → Skyline Mine No. 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry  LaViers Jr → South-East Coal Company Inc; 1950-01-01 to 1999-12-07; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Skyline Mine No. 1; 1989-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coastal Coal Company, LLC → Skyline Mine No. 1; 1999-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Coastal Coal Company, LLC; 1999-12-08 to current/open; source msha-controller-operator-history