# Relationship history for MSHA mine 2602347

Current hierarchy: **Pacific Coast Building Products Inc → Sandia Aggregates - PABCO Building Products LLC → PABCO 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

- **operator_operates_mine:** Sandia Construction Inc. → PABCO SAND/GRAVEL; 1998-04-01 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → PABCO SAND/GRAVEL; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Sandia Construction Inc.; 1998-04-01 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Sandia Aggregates - PABCO Building Products LLC → PABCO SAND/GRAVEL; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pacific Coast Building Products Inc → PABCO SAND/GRAVEL; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pacific Coast Building Products Inc → Sandia Aggregates - PABCO Building Products LLC; 2002-05-29 to current/open; source msha-controller-operator-history