# Relationship history for MSHA mine 2102857

Current hierarchy: **William F  Holst III → Holst Excavating Inc → Holst Portable No 3**

- 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:** Charlson Arnold → Holst Portable No 3; 1950-01-01 to 1987-07-05; source msha-controller-operator-history
- **operator_operates_mine:** Charlson Excavating Inc → Holst Portable No 3; 1981-06-01 to 1987-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Charlson Arnold → Charlson Excavating Inc; 1981-06-01 to 1987-07-05; source msha-controller-operator-history
- **controller_controls_mine:** William F  Holst III → Holst Portable No 3; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holst Excavating Inc → Holst Portable No 3; 1987-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William F  Holst III → Holst Excavating Inc; 1987-07-06 to current/open; source msha-controller-operator-history