# Relationship history for MSHA mine 1901280

Current hierarchy: **Peter J  Opachinski → SLT Construction Corp. → Spring Street 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

- **controller_controls_mine:** Peter J  Opachinski → Spring Street Pit; 2000-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SLT Construction Corp. → Spring Street Pit; 2018-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter J  Opachinski → SLT Construction Corp.; 2018-07-12 to current/open; source msha-controller-operator-history