# Relationship history for MSHA mine 4202358

Current hierarchy: **Estate of Randy Tomaiko; Ed  Burgess → Quality Excavation → Quality Kolberg 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:** Ed  Burgess et al → Quality Kolberg Screen; 2000-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Excavation → Quality Kolberg Screen; 2002-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Burgess et al → Quality Excavation; 2002-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Randy Tomaiko et al → Quality Excavation; 2002-12-10 to current/open; source msha-controller-operator-history