# Relationship history for MSHA mine 3608153

Current hierarchy: **Roger  Bressler → R B Contracting → Gardner Hill**

- 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:** Roger  Bressler → Gardner Hill; 1989-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R B Contracting → Gardner Hill; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Bressler → R B Contracting; 1990-02-01 to current/open; source msha-controller-operator-history