# Relationship history for MSHA mine 3901074

Current hierarchy: **Smutny John C → John C Smutny Excavating → Paul Liebel 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:** John C Smutny Excavating → Paul Liebel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smutny John C → Paul Liebel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smutny John C → John C Smutny Excavating; 1950-01-01 to current/open; source msha-controller-operator-history