# Relationship history for MSHA mine 4202478

Current hierarchy: **Vern  Shumway → PoorBoy Mining & Construction → King Mine**

- 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:** PoorBoy Mining & Construction → King Mine; 2007-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vern  Shumway → King Mine; 2007-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vern  Shumway → PoorBoy Mining & Construction; 2007-06-21 to current/open; source msha-controller-operator-history