# Relationship history for MSHA mine 1515844

Current hierarchy: **Einstein John L Iii → Phoenix Equipment Company Inc → Wolf Creek**

- 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:** Phoenix Equipment Company Inc → Wolf Creek; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Einstein John L Iii → Wolf Creek; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Einstein John L Iii → Phoenix Equipment Company Inc; 1986-11-01 to current/open; source msha-controller-operator-history