# Relationship history for MSHA mine 4104928

Current hierarchy: **Robert  Robinson → Gulf Coast Limestone Inc → Burnet Screening 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:** Gulf Coast Limestone Inc → Burnet Screening Plant; 2012-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Robinson → Burnet Screening Plant; 2012-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Robinson → Gulf Coast Limestone Inc; 2012-01-31 to current/open; source msha-controller-operator-history