# Relationship history for MSHA mine 4606926

Current hierarchy: **K C Holding Company → Kesscoals Inc → No 4 Surface Mine**

- 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

- **controller_controls_mine:** K C Holding Company → No 4 Surface Mine; 1982-05-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kesscoals Inc → No 4 Surface Mine; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** K C Holding Company → Kesscoals Inc; 1985-05-01 to current/open; source msha-controller-operator-history