# Relationship history for MSHA mine 2601694

Current hierarchy: **Schofield Bob L → Nevada Barite & Mineral Corp → Hope 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Schofield Bob L → Hope 1; 1980-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nevada Barite & Mineral Corp → Hope 1; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schofield Bob L → Nevada Barite & Mineral Corp; 1980-12-01 to current/open; source msha-controller-operator-history