# Relationship history for MSHA mine 1001922

Current hierarchy: **Rick R Olander → O-K Paving Inc → SOUTH FORK 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Rick R Olander → SOUTH FORK PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** O-K Paving Inc → SOUTH FORK PIT; 1996-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick R Olander → O-K Paving Inc; 1996-07-01 to current/open; source msha-controller-operator-history