# Relationship history for MSHA mine 3201091

Current hierarchy: **Steve  Jacobson → B & J EXCAVATING INC → WP 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

- **controller_controls_mine:** Steve  Jacobson et al → WP 1; 2017-04-05 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Jacobson → WP 1; 2018-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & J EXCAVATING INC → WP 1; 2024-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Jacobson et al → B & J EXCAVATING INC; 2024-04-16 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Burkhartsmeier et al → B & J EXCAVATING INC; 2024-04-16 to 2017-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Jacobson → B & J EXCAVATING INC; 2024-04-16 to current/open; source msha-controller-operator-history