# Relationship history for MSHA mine 2103162

Current hierarchy: **Central Allied Enterprises Inc → Central Allied Enterprises Inc → CENTRAL SAND & GRAVEL PORTABLE W**

- 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

- **controller_controls_mine:** Central Allied Enterprises Inc → CENTRAL SAND & GRAVEL PORTABLE W; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Allied Enterprises Inc → CENTRAL SAND & GRAVEL PORTABLE W; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Central Allied Enterprises Inc → Central Allied Enterprises Inc; 1998-06-01 to current/open; source msha-controller-operator-history