# Relationship history for MSHA mine 3200558

Current hierarchy: **Hughes Tony → Williston Ready Mix Inc → Hughes Pit & 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Williston Ready-Mix Inc → Hughes Pit & Plant; 1950-01-01 to 1985-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Streifel Norman → Hughes Pit & Plant; 1950-01-01 to 1985-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Streifel Norman → Williston Ready-Mix Inc; 1950-01-01 to 1985-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Williston Ready Mix Inc → Hughes Pit & Plant; 1985-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Tony → Hughes Pit & Plant; 1985-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Tony → Williston Ready Mix Inc; 1985-01-31 to current/open; source msha-controller-operator-history