# Relationship history for MSHA mine 1001350

Current hierarchy: **Arthur R  Brand → B & N Construction Inc → O'Hara Rock Source**

- 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:** United States Government → O'Hara Rock Source; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur R  Brand → O'Hara Rock Source; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Forest Service → O'Hara Rock Source; 1978-03-09 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Forest Service; 1978-03-09 to 1980-10-08; source msha-controller-operator-history
- **operator_operates_mine:** B & N Construction Inc → O'Hara Rock Source; 1980-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur R  Brand → B & N Construction Inc; 1980-10-09 to current/open; source msha-controller-operator-history