# Relationship history for MSHA mine 2003471

Current hierarchy: **Philip  Hecht → Twin Springs Aggregate Inc → Twin Springs Aggregrate Inc**

- 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:** Twin Springs Aggregate Inc → Twin Springs Aggregrate Inc; 2013-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Philip  Hecht → Twin Springs Aggregrate Inc; 2013-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip  Hecht → Twin Springs Aggregate Inc; 2013-06-08 to current/open; source msha-controller-operator-history