# Relationship history for MSHA mine 4703373

Current hierarchy: **Donald J  Antczak → Antczak Construction Inc. → Barber-Green**

- 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:** Antczak Construction Inc. → Barber-Green; 2004-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald J  Antczak → Barber-Green; 2004-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald J  Antczak → Antczak Construction Inc.; 2004-03-29 to current/open; source msha-controller-operator-history