# Relationship history for MSHA mine 3304782

Current hierarchy: **National Lime & Stone Co. → The National Lime and Stone Company → Metso Lokotrack Crusher (Asset#10439)**

- 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

- **controller_controls_mine:** National Lime & Stone Co. → Metso Lokotrack Crusher (Asset#10439); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The National Lime and Stone Company → Metso Lokotrack Crusher (Asset#10439); 2022-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** National Lime & Stone Co. → The National Lime and Stone Company; 2022-08-31 to current/open; source msha-controller-operator-history