# Relationship history for MSHA mine 3002449

Current hierarchy: **Mather James D → Hunn'S Lake Sand & Gravel Inc → Hunn'S Lake Sand & Gravel Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Liberta Brothers Inc → Hunn'S Lake Sand & Gravel Incorporated; 1979-01-01 to 1988-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Liberta Leonard → Hunn'S Lake Sand & Gravel Incorporated; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Liberta Leonard → Liberta Brothers Inc; 1979-01-01 to 1988-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Hunn'S Lake Sand & Gravel Inc → Hunn'S Lake Sand & Gravel Incorporated; 1988-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mather James D → Hunn'S Lake Sand & Gravel Incorporated; 1988-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mather James D → Hunn'S Lake Sand & Gravel Inc; 1988-10-09 to current/open; source msha-controller-operator-history