# Relationship history for MSHA mine 2402778

Current hierarchy: **Charles Emile  Otto → Havre Sand & Gravel, Inc → Temporary Screen**

- 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:** Otto  Baltrusch  et al → Temporary Screen; 1950-01-01 to 2003-03-13; source msha-controller-operator-history
- **controller_controls_mine:** William H  Baltrusch → Temporary Screen; 2003-03-14 to 2017-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Betty Jean  Baltrusch → Temporary Screen; 2017-02-26 to 2018-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Charles Emile  Otto → Temporary Screen; 2018-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Havre Sand & Gravel, Inc → Temporary Screen; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Baltrusch → Havre Sand & Gravel, Inc; 2022-05-10 to 2017-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Betty Jean  Baltrusch → Havre Sand & Gravel, Inc; 2022-05-10 to 2018-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Charles Emile  Otto → Havre Sand & Gravel, Inc; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Otto  Baltrusch  et al → Havre Sand & Gravel, Inc; 2022-05-10 to 2003-03-13; source msha-controller-operator-history