# Relationship history for MSHA mine 1901021

Current hierarchy: **Stracuzzi V J → V J Stracuzzi → Hinsdale Pit**

- 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:** V J Stracuzzi → Hinsdale Pit; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stracuzzi V J → Hinsdale Pit; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stracuzzi V J → V J Stracuzzi; 1989-11-01 to current/open; source msha-controller-operator-history