# Relationship history for MSHA mine 2200034

Current hierarchy: **John D  Mitchell → Louisville Brick Company Inc → Louisville Brick Clay 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Louisville Brick Company → Louisville Brick Clay Pit; 1950-01-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_mine:** T M  Mitchell et al → Louisville Brick Clay Pit; 1950-01-01 to 1986-03-05; source msha-controller-operator-history
- **controller_controls_operator:** T M  Mitchell et al → Louisville Brick Company; 1950-01-01 to 1986-03-05; source msha-controller-operator-history
- **operator_operates_mine:** Louisville Brick Company Inc → Louisville Brick Clay Pit; 1986-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John D  Mitchell → Louisville Brick Clay Pit; 1986-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Mitchell → Louisville Brick Company Inc; 1986-03-06 to current/open; source msha-controller-operator-history