# Relationship history for MSHA mine 3605862

Current hierarchy: **Behm John G → John Behm Coal Company → Castle Comer Tunnel**

- 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

- **operator_operates_mine:** John Behm Coal Company → Castle Comer Tunnel; 1975-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Behm John G → Castle Comer Tunnel; 1975-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Behm John G → John Behm Coal Company; 1975-11-07 to current/open; source msha-controller-operator-history