# Relationship history for MSHA mine 0302105

Current hierarchy: **Luke B Duffield → Duffield Aggregate, LLC → Lamar 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Luke B Duffield → Lamar Quarry; 2023-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Duffield Aggregate, LLC → Lamar Quarry; 2026-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luke B Duffield → Duffield Aggregate, LLC; 2026-05-19 to current/open; source msha-controller-operator-history