# Relationship history for MSHA mine 3201065

Current hierarchy: **Steve  Jacobson → B&J Excavating Inc. → Jacobson Eaton**

- 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:** B&J Excavating Inc. → Jacobson Eaton; 2017-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Burkhartsmeier et al → Jacobson Eaton; 2017-04-05 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Burkhartsmeier et al → B&J Excavating Inc.; 2017-04-05 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Jacobson et al → B&J Excavating Inc.; 2017-04-05 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Jacobson → Jacobson Eaton; 2018-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Jacobson → B&J Excavating Inc.; 2018-01-01 to current/open; source msha-controller-operator-history