# Relationship history for MSHA mine 4103603

Current hierarchy: **Albert  Closner → South Texas Utility Contractors Inc → C & H GRAVEL PLANT**

- 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:** South Texas Utility Contractors Inc → C & H GRAVEL PLANT; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert  Closner → C & H GRAVEL PLANT; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert  Closner → South Texas Utility Contractors Inc; 1990-04-01 to current/open; source msha-controller-operator-history