# Relationship history for MSHA mine 3401174

Current hierarchy: **Coffey Paul D → C E C Sand Inc → 8th Street 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** C E C Sand Inc → 8th Street Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coffey Paul D → 8th Street Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coffey Paul D → C E C Sand Inc; 1979-01-01 to current/open; source msha-controller-operator-history