# Relationship history for MSHA mine 3607393

Current hierarchy: **Fulton Robert E → K & B Coal Company Inc → K & B Coal Co Inc**

- 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 Coal Company Inc → K & B Coal Co Inc; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fulton Robert E → K & B Coal Co Inc; 1982-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fulton Robert E → K & B Coal Company Inc; 1982-11-01 to current/open; source msha-controller-operator-history