# Relationship history for MSHA mine 4102930

Current hierarchy: **Basic Industries Inc → South Texas Construction Company → Mobil Crusher No 32505**

- 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:** Basic Industries Inc → Mobil Crusher No 32505; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Texas Construction Company → Mobil Crusher No 32505; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Basic Industries Inc → South Texas Construction Company; 1979-12-01 to current/open; source msha-controller-operator-history