# Relationship history for MSHA mine 0404325

Current hierarchy: **Caprista William → William Caprista Underground Construction Inc → San Juan Sand Pit**

- 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:** William Caprista Underground Construction Inc → San Juan Sand Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Caprista William → San Juan Sand Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caprista William → William Caprista Underground Construction Inc; 1979-01-01 to current/open; source msha-controller-operator-history