# Relationship history for MSHA mine 2103363

Current hierarchy: **Mike J  Smude; Arnold M  Kowalczyk → Mike Smude → Kowalczyk 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:** Mike Smude → Kowalczyk Gravel; 2003-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike J  Smude Et Al → Kowalczyk Gravel; 2003-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike J  Smude Et Al → Mike Smude; 2003-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arnold M  Kowalczyk Et Al → Mike Smude; 2003-07-16 to current/open; source msha-controller-operator-history