# Relationship history for MSHA mine 2602730

Current hierarchy: **N A Degerstrom → N.A. Degerstrom, Inc. → Slaven 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:** Baker Hughes Inc → Slaven Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** N A Degerstrom → Slaven Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Baker Hughes Oil Field Operations Inc. → Slaven Mine; 2013-02-01 to 2013-09-17; source msha-controller-operator-history
- **controller_controls_operator:** Baker Hughes Inc → Baker Hughes Oil Field Operations Inc.; 2013-02-01 to 2013-09-17; source msha-controller-operator-history
- **operator_operates_mine:** N.A. Degerstrom, Inc → Slaven Mine; 2013-09-18 to 2016-04-25; source msha-controller-operator-history
- **controller_controls_operator:** N A Degerstrom → N.A. Degerstrom, Inc; 2013-09-18 to 2016-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Baker Hughes Oilfield Operations → Slaven Mine; 2016-04-26 to 2018-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Baker Hughes Inc → Baker Hughes Oilfield Operations; 2016-04-26 to 2018-10-25; source msha-controller-operator-history
- **operator_operates_mine:** N.A. Degerstrom, Inc. → Slaven Mine; 2018-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** N A Degerstrom → N.A. Degerstrom, Inc.; 2018-10-26 to current/open; source msha-controller-operator-history