# Relationship history for MSHA mine 2302527

Current hierarchy: **Matt  Blessant → Mulberry Limestone Quarry Company Inc. → Golden City Quarry**

- 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

- **controller_controls_mine:** Matt  Blessant → Golden City Quarry; 1991-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mulberry Limestone Quarry Company Inc. → Golden City Quarry; 2018-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Blessant → Mulberry Limestone Quarry Company Inc.; 2018-10-18 to current/open; source msha-controller-operator-history