# Relationship history for MSHA mine 0900800

Current hierarchy: **David M  Smith → D M S Construction Company Inc → Lavender 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

- **operator_operates_mine:** Atlanta Brick & Tile Company → Lavender Pit; 1950-01-01 to 1979-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Jenkins Brick Company → Lavender Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jenkins Brick Company → Atlanta Brick & Tile Company; 1950-01-01 to 1979-10-24; source msha-controller-operator-history
- **operator_operates_mine:** D M S Construction Company Inc → Lavender Pit; 1979-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  Smith → Lavender Pit; 1979-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Smith → D M S Construction Company Inc; 1979-10-25 to current/open; source msha-controller-operator-history