# Relationship history for MSHA mine 3800198

Current hierarchy: **Pamona Corp → Richtex Corp → Dekalb Pit**

- 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:** Pamona Corp → Dekalb Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Brick & Tile Company → Dekalb Pit; 1950-01-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Eastern Brick & Tile Company → Dekalb Pit; 1950-01-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Eastern Brick & Tile Company → Eastern Brick & Tile Company; 1950-01-01 to 1978-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Richtex Corp → Dekalb Pit; 1978-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pamona Corp → Richtex Corp; 1978-06-23 to current/open; source msha-controller-operator-history