# Relationship history for MSHA mine 1300351

Current hierarchy: **Galvin R J → Sheffield Brick & Tile Co → Sheffield Clay Pit And 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:** Sheffield Brick & Tile Co → Sheffield Clay Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Galvin R J → Sheffield Clay Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Galvin R J → Sheffield Brick & Tile Co; 1950-01-01 to current/open; source msha-controller-operator-history