# Relationship history for MSHA mine 0504972

Current hierarchy: **David S  Zehner → Precision Excavating Inc → Peroulis Snake River Pit**

- 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:** David S  Zehner → Peroulis Snake River Pit; 1999-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Precision Excavating Inc → Peroulis Snake River Pit; 2010-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David S  Zehner → Precision Excavating Inc; 2010-10-12 to current/open; source msha-controller-operator-history