# Relationship history for MSHA mine 0203070

Current hierarchy: **McCormick Inc → McCormick Construction Company → Pass Canyon 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:** McCormick Inc → Pass Canyon Pit; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McCormick Construction Company → Pass Canyon Pit; 2004-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** McCormick Inc → McCormick Construction Company; 2004-11-17 to current/open; source msha-controller-operator-history