# Relationship history for MSHA mine 3605694

Current hierarchy: **Stankiewicz Frank → Ann Coal Company → No 1 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

- **operator_operates_mine:** Ann Coal Company → No 1 Slope; 1975-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stankiewicz Frank Et Al → No 1 Slope; 1975-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stankiewicz Frank Et Al → Ann Coal Company; 1975-09-03 to current/open; source msha-controller-operator-history