# Relationship history for MSHA mine 2901268

Current hierarchy: **General Dynamics Corp → El Paso Sand Products Inc → Anapra Quarry**

- 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:** General Dynamics Corp → Anapra Quarry; 1983-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** El Paso Sand Products Inc → Anapra Quarry; 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → El Paso Sand Products Inc; 1987-01-01 to current/open; source msha-controller-operator-history