# Relationship history for MSHA mine 4801914

Current hierarchy: **Glen  Wise → Wyoming Earthmoving Corporation → Superbase Screen**

- 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:** Glen  Wise → Superbase Screen; 2026-03-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Earthmoving Corporation → Superbase Screen; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glen  Wise → Wyoming Earthmoving Corporation; 2026-04-01 to current/open; source msha-controller-operator-history