# Relationship history for MSHA mine 1103120

Current hierarchy: **Donald R  Swinson → Swinson Materials, Inc. → Levings Lake Quarry**

- 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:** Swinson Materials, Inc. → Levings Lake Quarry; 2003-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Swinson → Levings Lake Quarry; 2003-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Swinson → Swinson Materials, Inc.; 2003-10-15 to current/open; source msha-controller-operator-history