# Relationship history for MSHA mine 0500960

Current hierarchy: **Continental Materials Corp → Transit Mix Of Pueblo → PUEBLO CONCRETE**

- 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:** Continental Materials Corp → PUEBLO CONCRETE; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valco Inc → PUEBLO CONCRETE; 1950-01-01 to 1997-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Brubaker → PUEBLO CONCRETE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Brubaker → Valco Inc; 1950-01-01 to 1997-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Transit Mix Of Pueblo → PUEBLO CONCRETE; 1997-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Continental Materials Corp → Transit Mix Of Pueblo; 1997-03-25 to current/open; source msha-controller-operator-history