# Relationship history for MSHA mine 2103082

Current hierarchy: **Patrick J  Dresel → Dresel's Aggregate, 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

- **controller_controls_mine:** Patrick J  Dresel → PORTABLE #1; 1989-05-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dresel's Aggregate, Inc. → PORTABLE #1; 1994-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick J  Dresel → Dresel's Aggregate, Inc.; 1994-08-01 to current/open; source msha-controller-operator-history