# Relationship history for MSHA mine 3503483

Current hierarchy: **Barbara Jean Gerulf; Steven Chad  Gerulf; Steven R Gerulf; Matthew R Ger → Steve's Backhoe Service Inc. → SBS Sand and Gravel**

- 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:** Riley J  Hill → SBS Sand and Gravel; 1993-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Riley Hill General Contractor Inc → SBS Sand and Gravel; 1999-08-01 to 2023-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Riley J  Hill → Riley Hill General Contractor Inc; 1999-08-01 to 2023-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Steve's Backhoe Service Inc. → SBS Sand and Gravel; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barbara Jean Gerulf et al → SBS Sand and Gravel; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara Jean Gerulf et al → Steve's Backhoe Service Inc.; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven R Gerulf et al → Steve's Backhoe Service Inc.; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven Chad  Gerulf et al → Steve's Backhoe Service Inc.; 2023-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew R Gerulf et al → Steve's Backhoe Service Inc.; 2023-10-01 to current/open; source msha-controller-operator-history