# Relationship history for MSHA mine 1101850

Current hierarchy: **Mason  Mobarak → Rock River Ready Mix Inc → Rock River Ready Mix Inc-Sand & Gravel D**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Rock River Ready Mix Inc → Rock River Ready Mix Inc-Sand & Gravel D; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adel A  Mobarak → Rock River Ready Mix Inc-Sand & Gravel D; 1950-01-01 to 2024-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Adel A  Mobarak → Rock River Ready Mix Inc; 1950-01-01 to 2024-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mason  Mobarak et al → Rock River Ready Mix Inc-Sand & Gravel D; 2025-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mason  Mobarak et al → Rock River Ready Mix Inc; 2025-01-01 to current/open; source msha-controller-operator-history