# Relationship history for MSHA mine 2402539

Current hierarchy: **Jane S  Johnson; Kevin R  Johnson → Montana Bentonite LLC → Montana Bentonite**

- 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

- **operator_operates_mine:** Montana Bentonite LLC → Montana Bentonite; 2008-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin R  Johnson et al → Montana Bentonite; 2008-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin R  Johnson et al → Montana Bentonite LLC; 2008-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jane S  Johnson et al → Montana Bentonite LLC; 2008-11-14 to current/open; source msha-controller-operator-history