# Relationship history for MSHA mine 3100146

Current hierarchy: **Thomas G Fisher → Nash Brick Company → Ita**

- 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

- **operator_operates_mine:** Nash Brick Company Inc → Ita; 1950-01-01 to 1994-03-08; source msha-controller-operator-history
- **controller_controls_mine:** W R  Coleman → Ita; 1950-01-01 to 1994-03-08; source msha-controller-operator-history
- **controller_controls_operator:** W R  Coleman → Nash Brick Company Inc; 1950-01-01 to 1994-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Nash Brick Company → Ita; 1994-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas G Fisher → Ita; 1994-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas G Fisher → Nash Brick Company; 1994-03-09 to current/open; source msha-controller-operator-history