# Relationship history for MSHA mine 4605999

Current hierarchy: **Goodell Mont E → K B G Coal Company → K B G #1**

- 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:** K B G Coal Company → K B G #1; 1979-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Goodell Mont E Et Al → K B G #1; 1979-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goodell Mont E Et Al → K B G Coal Company; 1979-05-01 to current/open; source msha-controller-operator-history