# Relationship history for MSHA mine 2104078

Current hierarchy: **Christine A  Loff; Leslie M  Loff → West Central Ready Mix Sand & Gravel LLC → West Central Ready Mix Sand & Gravel LLC**

- 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:** West Central Sand & Gravel LLC → West Central Ready Mix Sand & Gravel LLC; 2024-07-15 to 2025-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Leslie M  Loff et al → West Central Ready Mix Sand & Gravel LLC; 2024-07-15 to 2025-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Leslie M  Loff et al → West Central Sand & Gravel LLC; 2024-07-15 to 2025-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Christine A  Loff et al → West Central Sand & Gravel LLC; 2024-07-15 to 2025-01-14; source msha-controller-operator-history
- **operator_operates_mine:** West Central Ready Mix Sand & Gravel LLC → West Central Ready Mix Sand & Gravel LLC; 2025-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christine A  Loff et al → West Central Ready Mix Sand & Gravel LLC; 2025-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christine A  Loff et al → West Central Ready Mix Sand & Gravel LLC; 2025-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leslie M  Loff et al → West Central Ready Mix Sand & Gravel LLC; 2025-01-15 to current/open; source msha-controller-operator-history