# Relationship history for MSHA mine 4703931

Current hierarchy: **Robert C  Epping → TV Materials Inc → High View Sand & Gravel**

- 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:** TV Materials Inc → High View Sand & Gravel; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert C  Epping → High View Sand & Gravel; 2023-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  Epping → TV Materials Inc; 2023-01-05 to current/open; source msha-controller-operator-history