# Relationship history for MSHA mine 3606565

Current hierarchy: **Dorkoski Kenneth & Henry J Bernas → G & B Coal Company → West Cameron Strip**

- 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:** G & B Coal Company → West Cameron Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dorkoski Kenneth & Henry J Bernas → West Cameron Strip; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorkoski Kenneth & Henry J Bernas → G & B Coal Company; 1977-11-01 to current/open; source msha-controller-operator-history