# Relationship history for MSHA mine 4103891

Current hierarchy: **J C  Berry → Berry Sand Gravel → BERRY 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Berry Sand Gravel → BERRY SAND & GRAVEL; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J C  Berry → BERRY SAND & GRAVEL; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J C  Berry → Berry Sand Gravel; 1996-02-01 to current/open; source msha-controller-operator-history