# Relationship history for MSHA mine 1002015

Current hierarchy: **Michael R Miller → M R Miller 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:** M R Miller Inc → Portable 1; 2001-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael R Miller → Portable 1; 2001-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael R Miller → M R Miller Inc; 2001-10-29 to current/open; source msha-controller-operator-history