# Relationship history for MSHA mine 4103550

Current hierarchy: **Atlas Concrete Inc → Ingram Enterprises Inc → Comanche 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:** Atlas Concrete Inc → Comanche Sand & Gravel; 1988-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Enterprises Inc → Comanche Sand & Gravel; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Atlas Concrete Inc → Ingram Enterprises Inc; 1988-11-01 to current/open; source msha-controller-operator-history