# Relationship history for MSHA mine 4105908

Current hierarchy: **Barnard Construction Company, Inc → Barnard Construction Company Inc → Dyer Quarry**

- 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:** Timothy  Barnard → Dyer Quarry; 1985-10-01 to 2026-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Barnard Construction Company Inc → Dyer Quarry; 2026-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnard Construction Company, Inc → Dyer Quarry; 2026-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnard Construction Company, Inc → Barnard Construction Company Inc; 2026-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Barnard → Barnard Construction Company Inc; 2026-07-23 to 2026-07-22; source msha-controller-operator-history