# Relationship history for MSHA mine 3608728

Current hierarchy: **Matthew J  Polenik → ALVERDA ENTERPRISES, INC. → POLENIK MINE**

- 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:** Alverda Enterprises, Inc. → POLENIK MINE; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew J  Polenik → POLENIK MINE; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew J  Polenik → Alverda Enterprises, Inc.; 1998-04-01 to current/open; source msha-controller-operator-history