# Relationship history for MSHA mine 1002350

Current hierarchy: **Pam J Beck; David L Beck → DL Beck, Inc. → Portable 1**

- 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:** DL Beck, Inc. → Portable 1; 2023-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pam J Beck et al → Portable 1; 2023-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pam J Beck et al → DL Beck, Inc.; 2023-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L Beck et al → DL Beck, Inc.; 2023-05-17 to current/open; source msha-controller-operator-history