# Relationship history for MSHA mine 3200569

Current hierarchy: **Fjeldahl Daniel → Des Lacs Sand & Gravel Inc → DES LACS PIT**

- 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

- **operator_operates_mine:** Des Lacs Sand & Gravel Inc → DES LACS PIT; 1977-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fjeldahl Daniel → DES LACS PIT; 1977-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fjeldahl Daniel → Des Lacs Sand & Gravel Inc; 1977-12-15 to current/open; source msha-controller-operator-history