# Relationship history for MSHA mine 0405624

Current hierarchy: **John D  Cederquist → SWIFT TECTONICS, INC. → PANCHO RICO SAND AND 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** John D  Cederquist → PANCHO RICO SAND AND GRAVEL; 2000-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SWIFT TECTONICS, INC. → PANCHO RICO SAND AND GRAVEL; 2004-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Cederquist → SWIFT TECTONICS, INC.; 2004-12-21 to current/open; source msha-controller-operator-history