# Relationship history for MSHA mine 4002206

Current hierarchy: **Mc Cullah Glen → Black Mountain Coal Company → No 1 Tipple**

- 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

- **controller_controls_mine:** Mc Cullah Glen → No 1 Tipple; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Mountain Coal Company → No 1 Tipple; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cullah Glen → Black Mountain Coal Company; 1977-04-01 to current/open; source msha-controller-operator-history