# Relationship history for MSHA mine 3402095

Current hierarchy: **Sandra K Chambers → North Canadian Holding → North Canadian Holding**

- 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:** North Canadian Holding → North Canadian Holding; 2009-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred W.  Chambers → North Canadian Holding; 2009-11-16 to 2015-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Fred W.  Chambers → North Canadian Holding; 2009-11-16 to 2015-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Sandra K Chambers → North Canadian Holding; 2015-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra K Chambers → North Canadian Holding; 2015-07-09 to current/open; source msha-controller-operator-history