# Relationship history for MSHA mine 5001965

Current hierarchy: **John C  Ellsworth → Alaska Frontier Constructors, Inc. → AFC Crusher**

- 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:** Alaska Frontier Constructors, Inc. → AFC Crusher; 2011-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John C  Ellsworth → AFC Crusher; 2011-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Ellsworth → Alaska Frontier Constructors, Inc.; 2011-09-29 to current/open; source msha-controller-operator-history