# Relationship history for MSHA mine 0900968

Current hierarchy: **Johnson Jack → Cherokee Mining & Exploration Company Inc → Long Branch Sand & Gravel Div**

- 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:** Cherokee Mining & Exploration Company Inc → Long Branch Sand & Gravel Div; 1985-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Jack → Long Branch Sand & Gravel Div; 1985-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Jack → Cherokee Mining & Exploration Company Inc; 1985-03-01 to current/open; source msha-controller-operator-history