# Relationship history for MSHA mine 4002616

Current hierarchy: **Johnson John H → J J Mining Inc → Mine No 1**

- 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:** J J Mining Inc → Mine No 1; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson John H Et Al → Mine No 1; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson John H Et Al → J J Mining Inc; 1980-05-01 to current/open; source msha-controller-operator-history