# Relationship history for MSHA mine 1103070

Current hierarchy: **Branko  Vardijan → Sheridan Sand  Gravel → Sheridan 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

- **controller_controls_mine:** Branko  Vardijan → Sheridan Sand  Gravel; 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sheridan Sand  Gravel → Sheridan Sand  Gravel; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Branko  Vardijan → Sheridan Sand  Gravel; 2000-07-01 to current/open; source msha-controller-operator-history