# Relationship history for MSHA mine 3608532

Current hierarchy: **Olaf Richard S → Olaf Coal Company Inc → #2 Slope**

- 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:** Olaf Richard S Et Al → #2 Slope; 1983-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Olaf Coal Company Inc → #2 Slope; 1995-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olaf Richard S Et Al → Olaf Coal Company Inc; 1995-11-01 to current/open; source msha-controller-operator-history