# Relationship history for MSHA mine 0801329

Current hierarchy: **E R Jahna  Industries Inc → E R Jahna Industries Inc → Green Bay Mine**

- 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

- **controller_controls_mine:** E R Jahna  Industries Inc → Green Bay Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E R Jahna Management Inc → Green Bay Mine; 2004-03-10 to 2006-11-26; source msha-controller-operator-history
- **controller_controls_mine:** E R Jahna  Industries Inc → Green Bay Mine; 2004-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E R Jahna  Industries Inc → E R Jahna Management Inc; 2004-03-10 to 2006-11-26; source msha-controller-operator-history
- **operator_operates_mine:** E R Jahna Industries Inc → Green Bay Mine; 2006-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E R Jahna  Industries Inc → E R Jahna Industries Inc; 2006-11-27 to current/open; source msha-controller-operator-history