# Relationship history for MSHA mine 5001853

Current hierarchy: **Lynden Inc → Knik Construction → Ugadaga 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:** Lynden Inc → Ugadaga Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Alaska Contractors, LLC → Ugadaga Quarry; 2006-08-28 to 2023-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Glenn R  Olson et al → Ugadaga Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn R  Olson et al → Northern Alaska Contractors, LLC; 2006-08-28 to 2023-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Archie  Stepp et al → Northern Alaska Contractors, LLC; 2006-08-28 to 2023-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Knik Construction → Ugadaga Quarry; 2023-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynden Inc → Knik Construction; 2023-11-23 to current/open; source msha-controller-operator-history