# Relationship history for MSHA mine 2300317

Current hierarchy: **Schottco Corp → Alton Brick Company → Alton Brick Co Pit & Plant**

- 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

- **operator_operates_mine:** Alton Brick Company → Alton Brick Co Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schottco Corp → Alton Brick Co Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schottco Corp → Alton Brick Company; 1950-01-01 to current/open; source msha-controller-operator-history