# Relationship history for MSHA mine 4103031

Current hierarchy: **Bruton Charles E → Charles E Bruton Sand/Gravel Company → C E Bruton 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Charles E Bruton Sand/Gravel Company → C E Bruton Pit; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruton Charles E → C E Bruton Pit; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruton Charles E → Charles E Bruton Sand/Gravel Company; 1980-09-01 to current/open; source msha-controller-operator-history