# Relationship history for MSHA mine 0202642

Current hierarchy: **Peter Kiewit Sons' Inc → United Metro Materials Inc → SAN XAVIER ROCK & MATERIALS PLAN**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Peter Kiewit Sons' Inc → SAN XAVIER ROCK & MATERIALS PLAN; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** United Metro Materials Inc → SAN XAVIER ROCK & MATERIALS PLAN; 1995-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → United Metro Materials Inc; 1995-10-01 to current/open; source msha-controller-operator-history