# Relationship history for MSHA mine 4801797

Current hierarchy: **Allen E  Gorzalka; Kenneth A  Gorzalka → WYO Group Construction, LLC → WGC Masaba**

- 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:** WYO Group Construction, LLC → WGC Masaba; 2016-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth A  Gorzalka et al → WGC Masaba; 2016-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth A  Gorzalka et al → WYO Group Construction, LLC; 2016-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen E  Gorzalka et al → WYO Group Construction, LLC; 2016-04-05 to current/open; source msha-controller-operator-history