# Relationship history for MSHA mine 4503853

Current hierarchy: **William  Poppie → Central Rock, 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Central Rock, Inc. → Portable 1; 2024-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Poppie → Portable 1; 2024-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Poppie → Central Rock, Inc.; 2024-09-24 to current/open; source msha-controller-operator-history