# Relationship history for MSHA mine 3606693

Current hierarchy: **Johnstown Coal & Coke Company → Source Mining Inc → Cherry Corner**

- 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:** Source Mining Inc → Cherry Corner; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnstown Coal & Coke Company → Cherry Corner; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnstown Coal & Coke Company → Source Mining Inc; 1978-04-01 to current/open; source msha-controller-operator-history