# Relationship history for MSHA mine 0201653

Current hierarchy: **Norman D  Heath → Valley Concrete & Materials Inc → Crushing And Screening 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Valley Concrete & Materials Inc → Crushing And Screening Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norman D  Heath → Crushing And Screening Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman D  Heath → Valley Concrete & Materials Inc; 1950-01-01 to current/open; source msha-controller-operator-history