# Relationship history for MSHA mine 3606024

Current hierarchy: **Kabonick Robert & Herbert L Wolf → K & W Coal Company → 7 Vein Slope**

- 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:** K & W Coal Company → 7 Vein Slope; 1976-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kabonick Robert & Herbert L Wolf Et Al → 7 Vein Slope; 1976-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kabonick Robert & Herbert L Wolf Et Al → K & W Coal Company; 1976-03-19 to current/open; source msha-controller-operator-history