# Relationship history for MSHA mine 4003638

Current hierarchy: **Sarabjeet  Kaur; Jimmy  Singh → BIR Materials LLC → Deep Springs Development Site**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** BIR Materials LLC → Deep Springs Development Site; 2025-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy  Singh et al → Deep Springs Development Site; 2025-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy  Singh et al → BIR Materials LLC; 2025-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sarabjeet  Kaur et al → BIR Materials LLC; 2025-04-15 to current/open; source msha-controller-operator-history