# Relationship history for MSHA mine 2200028

Current hierarchy: **Jones R H → Holly Springs Brick & Tile Company → Holly Springs 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:** Holly Springs Brick & Tile Company → Holly Springs Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones R H → Holly Springs Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones R H → Holly Springs Brick & Tile Company; 1950-01-01 to current/open; source msha-controller-operator-history