# Relationship history for MSHA mine 4300764

Current hierarchy: **Steven W  Zaluzny → ZALUZNY EXCAVATING CORPORATION → POWERSCREEN WARRIOR 2100 PLANT**

- 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:** Steven W  Zaluzny et al → POWERSCREEN WARRIOR 2100 PLANT; 1989-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Zaluzny Excavating Corporation → POWERSCREEN WARRIOR 2100 PLANT; 2015-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven W  Zaluzny et al → Zaluzny Excavating Corporation; 2015-03-23 to current/open; source msha-controller-operator-history